Hostage Negotiation: So basically it's Sakuretsu Armor for direct attacks with a choice that no opponent in his right mind would take in order to get rid of it unless he was on the verge of winning? Nice.
Well, it's actually stronger than Sakuretsu in the sense that if you don't go for it you essentially lose your Battle Phase, because any sensible player would pick the monster that none of the opponent's other monsters can get past. ;3
Hmm.... WHY THE CHTHONIA HAS EVERYONE ASSUMED THAT I DON'T CARE ABOUT GUESSING MY CURRENT THEME IN CARD CREATION? HUH? YOU CAN'T ALL SERIOUSLY HAVE NO IDEA WHAT IT IS!!!!
Okay, fine, I wikied it. You're making blatant
Disgaea references. Happy?
Honestly, you're crying for attention almost shamelessly as Icha and his rocks. xD
The Overlord's Daughter: I think the condition should come first. (I.e. "If there are three or more differently named Monsters in your opponent's Removed From Play Pile, this card can attack twice in the same Battle Phase). Ehh...fair enough, I suppose, at least it's strong enough to take on recruiters.
Delal: "If there are two or more differently named monsters in your opponent's Removed From Play Pile, this card inflicts piercing damage. If there are five or more differently named monsters in your opponent's Removed From Play Pile, the original Atk of this card becomes 2400."
Whoa, this is strong. Very strong, actually. A bit of removed from play power and it's a tributeless Chthonian Emperor Dragon with pierce and even before you've removed anything it's a 1800-Atk beatstick. Ehh...I'd say drop its original Atk to 1600, make people work a little before they can reap the benefits.
Gallactic Cosmos: You misspelled 'galactic'. Besides, this name sounds sort of like saying "stellar star". It...sounds sort of tautological. x.O Also, on the wording. First off, because of the new wording practice you can just say ""Cosmic" Monsters" instead of "Monster with "Cosmic" in their names". The second part also has wording problems, that should be something like "For each "Luna, The Cosmic Sorceress" or "Sol, The Cosmic Knight" on your Field, increase the Atk and Def of each "Cosmic" Monster on the Field by 100."
Weak. Unless there are some strong card effects hinged on using this field then it's not worth playing.
Mars, The Cosmic Gladiator: See above about the wording practice. Weak card again, lukewarm Atk boosts don't pay off, really.
Venus, The Cosmic Lover: That's "Add one "Moon's Tear" or "Sun's Radiance" from your Deck to your Hand.". Add; not draw. Bleah, see my comments about the aforementioned cards.
Pluto, The Cosmic Reaper: So what, we can still get the flip effect without cosmos? Ehh...this would be the first worthwhile card in this set if it weren't crippled by being tied to the wimpy field. Flip monsters are classified as Effect too, by the way.
Saturn, The Cosmic Hourglass: One-sided, tributeless Jinzo? I could see this being played, but certainly
not the rest of the set. Broken, this effect is just too strong for an easily special summoned non-tribute monster.
Mercury, The Cosmic Messenger: cards on the field are destroyed, not discarded. Besides, that would be "on the Field", not "in play". Ehh...new approach to field searching, though given that the old field would be destroyed when you activate the new one, I dunno'. Could do with higher stats, really.
Moon's Tear + Luna: So let me see if I got this straight...I run this situational Normal Spell that costs me two specific monsters on my field (most of which are weak, and which would then be weighing down my deck) so I can summon...a glorified nomi which is a complete dead draw in its own right and has the stats of Gene-Warped Warwolf?
...
I don't think so. Seriously, nomis are a major liability in a deck, so they need to come with major benefits. This one just doesn't. :\
Oh, right, this has a secondary effect (Which, for some obscure reason, is separated from the original effect). So...if I summon the other ridiculously expensive nomi I can tribute (
Tribute, not discard) one of the wimpy little suckers I have to run to summon this in order to...get the equivalent of a more restricted Mystik Wok? No, just no. LP is cheap and this is an expensive method of obtaining it. If I wanted to run a deck packed to the brim with crazily situational cards I'd do Destiny Board, thanks. At least that has, you know, a win condition.
Sun's Radiance + Sol: Ehh...better than Luna, but still not worth the investment by a long shot. With two tributes I can summon Light and Darkness Dragon. (that doesn't require a situational spell card either) Why in the name of all that is sweet and sugary would I want to run this instead?
Bleah, they're all too weak (except for Saturn, which is way too strong) and you have a lot of wording problems. (YGO Wikia for the win, peoples. Seriously. >.<) A cosmic theme has the potential to be cool, but these cards just can't manage to get anything productive done. Not only are they weak individually; they have no serious synergies (100 extra Atk here and there doesn't count <.<) and the set as a whole lacks focus or even a clear gameplan of any kind and that completely defeats the purpose of a set.
So like, pick one defining trait for Cosmic monsters. Every proper set of monsters has their own thing (like the Ancient Gear thing is that you can't spring face-downs on the when they attack, or the Crystal Beast thing of crystalizing into the back row for future use), once you've got a centralized theme (not in names, but in effects) you can then focus on creating a winning strategy for the set. :3
To exemplify...
Deepsea Anemone
Aqua/Effect
2 Star/Water
800 Atk / 500 Def
When this Face-down card is attacked, you may flip this card Face-up to destroy the attacking Monster. After this effect is activated, return this card to the bottom of your Deck
Depth Charger
Sea Serpent/Effect
3 Star/Water
500 Atk / 500 Def
During your Main Phase, you may return up to three cards from your Graveyard to the bottom your Deck. For each card returned to your Deck by this effect, increase the Atk of this card by 500 until the end of the turn. When this card is destroyed by battle, select a card at random from your opponent's Hand and return it to the bottom of his/her Deck.
Elusive Conger
Sea Serpent/Effect
4 Star/Water
1600 Atk / 1300 Def
When this card would be affected by a card effect controlled by your opponent, you may return it to the bottom of your Deck instead.
Phantom Whale
Aqua/Effect
8 Star/Water
2800 Atk / 2600 Def
When this card attacks, your opponent may not activate any Card Effects until the end of the Damage Step. During the Main Phase of a turn when this card hasn't attacked, you may return 2 WATER Attribute Monsters from your Graveyard to the bottom of your Deck in order remove this card on your Field from play until your next Main Phase. (The Monster Card Zone this card was in is treated as occupied for this time) On the turn this card is returned to the Field after using this effect, this card can attack your opponent directly.
Seafloor Scavenger
Sea Serpent/Effect
900 Atk / 600 Def
2 Star/Water
FLIP: Add the bottom card of your Deck to your Hand.
Trench Diver
Sea Serpent/Effect
4 Star/Water
1700 Atk / 600 Def
When this card is Normal Summoned successfully, you may look at the bottom three cards of your Deck, then select one of them an place it at the top of your Deck. (the other cards are returned to the bottom of your Deck)
Sunken Treasures
Normal Spell
Guess the names of up to three cards, then -- for each card name you guessed -- reveal a card from the bottom of your Deck. If you guessed all of the card names correctly, draw until the number of cards in your Hand is equal to the number of card names you guessed. If you guessed wrong, your opponent draws a number of cards equal to the number of card names you guessed. Regardless, return all cards revealed by this effect to the bottom of your Deck in their original order.
Undertow
Counter Trap
This card can only be activated when your opponent activates a Card Effect. Reveal the bottom card of your Deck. If the card you revealed is of the same type as the card your opponent activated (Spell, Trap, or Effect Monster), negate the activation and effect of that card and destroy it. The card revealed by this effect is returned to the bottom of your Deck.