I'm really more of a hobbyist then a serious player.)
Same with me XD; I love to know how to play the game, and plays the video game of it, but I'm just too casual of one to really buy the cards XD; (Plus, when have you ever heard of university students having money for these types of expensive hobbies?)
Mage Power requires set s/t, and that's already enough of a reason for it to fail... it requires heavy investment to save yourself from Heavy Storm or Mobius nuke, so those traps better be all defensive traps or something to prevent those two. Then again, Exiled Force nukes the monster with the mage power, and all those s/t becomes "dead set" cards. Ben Kai uses Mage Power because it will win on the same turn all those s/t are set/equipped to Ben Kai itself.
Eikbyo-whatever (card that I can't spell, but yes Alter Ego got the right thing) is used as tech at very rare occassion awhile ago, since most people just don't like to pick on it to destroy it XD; for reasons you said, they'll just let other monsters come out and let the equipped monster die. The plus is that the equip card doesn't get wasted afterward, but comes back to the hand. I personally won't use it anyway, but apparently it works in some super-rogue decks.
The fact that Avian needs 2 cards (Avian itself + equip) to barely beat a D. D. Survivor is the problem... what if Avian doesn't have the equip card there to help him? Then he's a 1000 vanilla... D. D. Survivor is always 1800, and immune to common D. D. monsters, along with being a demi-god if Dimensional Fissure is out. Also, Avian isn't even part of any powerful fusions either except Flame Wingman (which is pointless because there's Shining Flame Wingman, and we can use King of the Swamp to substitute Flame Wingman to begin with.)
Really, elemental heroes only need Stratos (no brainer), 2 Sparkman, 2 Wildheart and 2 Clayman (Registeel from Pokemon invades YGO card game?) All the other E-heroes can be done away with through King of the Swamp. The other monster lineup of an E-Hero deck should be your typical warrior monsters to disarm any set monster to give your costly fusions as many direct shots as possible. Either that, or tutors/general defenses when fusion pieces are not ready yet.
Quickly Assembled Faulty Yet Decent for Casual Play E-Hero Deck
Monsters- 21
2 Cyber Dragons
3 King of the Swamp
1 Elemental Hero Stratos
2 E-Hero Sparkman
2 E-Hero Wildheart
2 E-hero Clayman
2 Giant Rat
2 Exiled Force
1 Injection Fairy Lily*/Cyber Dragon
1 D. D. Warrior Lady
2 D. D. Assailant
1 Neo Spacian Grand Mole
Spells- 17
2 Reinforcement of the Army
2 E- Emergency Call
1 Premature Burial
1 Heavy Storm
1 Mystical Space Typhoon
1 Snatch Steal
1 Confiscation
1 Nobleman of Crossout
2 Polymerization
2 Miracle Fusion
1 Smashing Ground
2 Enemy Controller
Traps- 4
3 Royal Decree
1 Mirror Force
Fusions-
Every fusion in your card collection until it has its own gravitational field, except TER
Never been a fan of E-heroes too much, so I don't know what are the ratios of the monsters really... I just made 2 of each.
Awfully fat deck, but with 4 spells being really direct search for monsters, it should still be ok? I went Royal Decree lineup because traps are somewhat back in action, and to conserve deck space because fusion parts eat space up like cheese, might as well minimize trap usage.
*Injection Fairy Lily in attack mode will basically halt any attack unless your LP is too low to pay for it. Call her out with Rat to stall and let her sit there. If it's open field, doesn't hurt to try and show the danger of the doctor's office. Remember that the 2000LP payment is on damage step. If there's a Sakuretsu, you will never have to pay. But hey, if you're iffy about her, there's always the safe path of Cyber Dragon.
If you don't have some of these cards, tell us and we can instantly think of good substitutions that are still decent yet not suck enough on the levels of Avian >>;