Hrekka, Tyrant of Skola Vale

Trample
Hrekka, Tyrant of Skola Vale enters the battlefield with X +1/+1 counters on it.
Whenever damage is dealt to Hrekka, Tyrant of Skola Vale, you may remove a +1/+1 counter from it. If you do, search your library for a Hydra creature card with power and toughness equal to 0 and put it onto the battlefield with a +1/+1 counter on it. Then, shuffle your library.