Abyss-steam X TRAP Draw cards equal to the number of different Monster Types among the monsters you control that are Fish, Sea Serpent, or Aqua monsters, also until the end of your next turn after this card resolves, you cannot Special Summon from the Extra Deck, except WATER monsters
It is powerful because it has an effect that could negate the very foundation of card games, let alone Yu-Gi-Oh
Of course, Baneslayer Angel is no mere sideboard card, nor is it purely in the domain of control decks
Water Water Dragon Cannot be Normal Summoned/Set
Its much more like Cube Draft in that waythe best decks are going to bear a lot more resemblance to Constructed decks than to the average Limited deck
However, this deck is weak against banish-focused decks and any other deck that can keep the Eldlich monster from activating its resurrection effect