Cavernous Maw - The Lost Caverns of Ixalan - 270

Land — Cave

{T}: Add {C}.
{2}: This land becomes a 3/3 Elemental creature until end of turn. It's still a Cave land. Activate only if the number of other Caves you control plus the number of Cave cards in your graveyard is three or greater.

Uncommon · The Lost Caverns of Ixalan · #270 (LCI)

Illustrated by Alfven Ato