Those other two shout Spirit Barrier to me. Instantaneous Pot of *, Destiny Draw, or other useful Normal Spell? Yeah, definitely used, especially with its relative there...the only thing that saves it from instant banning is how it's at the END of the Damage Step...but, on the other hand, as I said, Spirit barrier takes care of that problem. I'm not too sure if it would be exploitable, though, considering the timing and once-per-turn clause.
You know, Spirit of Malice is really just a weaker Diamond Dude (since it can't work in repeat and won't pull you free cards from your deck; it's not searchable either and needs an external trigger). Also, thematic support though it is, I'm not sure how viable Spirit Barrier really is as support. I mean, the instant kill effect for Spirit of Vengeance is just a disincentive for opponent's to attack with (something to really dampen their Battle Phase a little), hence why I'd say it's more dangerous as Monarch fodder. Speaking of which...Raiza screws them bother over pretty bad by bouncing them to your deck, I'd say, as does D.D Crow (By targeting either Spirit of Vengeance or the spell card you're trying to feed Spirit of Malice). :3
Ninjutsu Arts: Shadow Clone
Normal Trap
You can only activate this card when a monster on your side of the field with "Ninja" or "Sasuke" in its card name is declared as an attack target while there are at least two other face-up monsters on your side of the field in Attack Position. Pick up the attacked monster and two of your other face-up Attack Position monsters, shuffle them, and place them back on the field in face-down Attack Position. The attacking monster must then attack one of them. If it attacks the original attack target, you take damage equal to the attacked monster's ATK. If one of the other two monsters are attacked, the attacking monster's ATK becomes 0.
...Hyped-up Magical Hats?
That should be 'is' instead of 'are' at the end since it's only one of the monsters. Anyways, this thing is more situational than hats since it requires a full three monsters - one of them very specific - to be face-up on your field and it can't dump choice trap cards into the graveyard for retrieval effects. Add that to the fact that you still have a one in three chance to be burned by it as well and we have a very unprofitable scenario indeed.
As for Foolish Greed...yeah, it's basically meant to be a toned down Graceful (less control of the dump, less deck digging, and no Dark World exploit). Also, Serial Spell wouldn't work since both demand a full hand discard and you can't tribute (or in this case, discard) the same card(s) for two separate effects.
Anyways, something of a different theme this time, but...
Murky Depths
Field Spell
This card's name is treated as "Umi". During each End Phase, all face-up monsters on the field are turned face-down (Battle positions are not changed). Negate the effects of all face-down effect monsters destroyed by Water attribute monsters in battle.
Phantom Fish
Fish/Effect
3 Star/Water
1500 Atk/ 800 Def
While 'Umi' is face-up on your field, this card is not affected by any card effects except its own. If this card is designated as the target of a card effect while face down, it is flipped face-up (the Battle Position is not changed).
Seafloor Lurker
Aqua/Effect
4 Star/Water
1800 Atk / 500 Def
When this face-down card on the field is selected as an attack target, this card is switched into face-up Attack Position and the attacking monster is switched into Defense Position. Then, this card attacks the card that targeted it.
Soul Angler
Fish/Effect
5 Star/Water
2400 Atk/ 1200 Def
When this card attacks a monster on your opponent's field, you may tribute the targeted monster in order to special summon a monster from your opponent's graveyard whose level stars are greater than or equal to the level stars of the target monster to your opponent's field in the same position as the tributed monster. Then, this card and the monster summoned by this effect battle.