Mycelium Pathmaker

Landseize-- Whenever a land enters the battlefield under opponent's control, put a Mycelium counter on target land you control.
Lands you control with Mycelium counters have {t}: Mycelium Pathmaker explores (Reveal the top 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 the card back on top or into your graveyard.)