Akawalli, the Seething Tower (LCI 220)

Legendary Creature — Fungus • Mana cost: {1}{B}{G} • The Lost Caverns of Ixalan • Uncommon

Descend 4 — As long as there are four or more permanent cards in your graveyard, Akawalli gets +2/+2 and has trample.
Descend 8 — 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.

Illustrated by Simon Dominic.