Fern-Clan Infiltrator

Whenever a land enters the battlefield under an opponent's control, that player creates a 0/1
green Plant Spirit creature token with, "This
creature can't block."
At the beginning of each opponent's precombat
main phase, they reveal X cards from their hand,
where X is the number of plants they control.
Fern-Clan Infiltrator gets +X/+0 until the end of
your next turn, where X is the number of
nonland cards revealed this way.