Akawalli, the Seething Tower (The Lost Caverns of Ixalan)

Legendary Creature Ñ Fungus - Descend 4 Ñ As long as there are four or more permanent cards in your graveyard, Akawalli gets +2/+2 and has trample.
Descend 8 Ñ As long as there are eight or more permanent cards in your graveyard, Akawalli gets an additional +2/+2 and can't be blocked by more than one creature.