Mycetarian Rex

At the beginning of your upkeep, put a spore
counter on Mycetarian Rex, then propagate
equal to the number of spore counters on it.
Remove three spore counters from among
creatures you control: Create a 1/1 green
Saproling creature token.
Sacrifice XX Saprolings: Search your library for
a Fungus creature card with converted mana cost
X or less and put it onto the battlefield.