Akawalli, the Seething Tower

A three-mana 3/3 that costs nothing extra to grow: the whole payment is a graveyard you were going to fill anyway. What distinguishes it from the usual graveyard-matters payoff is the metric it counts. Descend only cares about permanent cards, not spells, so a yard stuffed with dead removal and burnt-out cantrips does nothing here; the card wants dead creatures, lands, artifacts, enchantments. That constraint pulls the deckbuilding toward self-mill and sacrifice rather than the more familiar spellslinger graveyard, and it means the two thresholds arrive at different rates depending on how permanent-heavy the shell is. The scaling itself is honest about its cost of admission: at four permanents in the yard it becomes a trampling 5/5, a body that stops chump-blocking from mattering; at eight it climbs to 7/7 and can be blocked by only one creature, which folds the go-wide defense that trample alone leaves open. The design reads the two classic ways to wall a large attacker (a single fat blocker, or a swarm) and answers each threshold with the counter to one of them. Because the counts are checked continuously rather than locked in on entry, a graveyard-hate wipe shrinks the tower back down mid-combat, so the size is only ever as durable as the yard beneath it.