Turntimber Hydra

Regenerate {g}{g}{g}
Lieutenant - As long as you control your
Commander, Turntimber Hydra gains Reach and
has "Whenever this creature attacks, it Explores. (Reveal the to card of your library. Put that card
into your hand if it's a land. Otherwise, put a
+1/+1 counter on this creature, then put that
card back or put it in your graveyard.)