Ethereal Hydra

Reach, hexproof
Whenever Ethereal Hydra kills a creature with
flying, put a +1/+1 counter on it.
Dredge 4 (If you would draw a card, instead you
may put exactly 4 cards from the top of your library
into your graveyard. If you do, return this card from
your graveyard to your hand with 2 +1/+1 counters
on it. Otherwise, draw a card.)