For those who couldn't read the card text clearly,
Genesis Hydra is a 0/0 rare Plant Hydra that costs XGG, having this ability:
"
When you cast Genesis Hydra, reveal the top X cards of your library. You may put a nonland permanent card with converted mana cost X or less from among them onto the battlefield. Then shuffle the rest into your library.
Genesis Hydra enters the battlefield with X +1/+1 counters o it."
Basically, we have a Genesis Wave attached on a creature. An intriguing note is whether ElfBall decks are going to replace Wave with the Hydra. I too play ElfBall in my casual plays, and I think I would be testing this one first. Genesis Wave particularly works well with elves because it can allow all my elves to get into play (key cards would be Heritage Druid), not to mention the ultimate finisher of the deck that is Emrakul. The plant hydra of M15, on the other hand, allows me to pick one of the cards revealed (ideally, Emrakul) and have an ideally massive creature aside from that Eldrazi.
Quick trivia: George Fan, the designer of Genesis Hydra, is also a designer for
Plants VS Zombies.
<
source>
