Mutagen Hive

Defender, Hexproof
At the beginning of your upkeep, you my exile a creature card from your graveyard. If you do, put
a +1/+1 counter on Mutagen Hive.
{b}{g}, Remove three +1/+1 counters from
Mutagen Hive: Create a token that's a copy of a creature exiled with Mutagen Hive.