Bumi, King of Three Trials

The scaling here is doing something quieter than most graveyard payoffs: the entry ability doesn't just get bigger with more Lessons in the yard, it gets broader. Each Lesson you've buried lets you pick up another mode, and because you choose up to X of the three distinct options, a fully-fueled cast lets you take all three at once rather than settling for the best one. That structure rewards a deck that fills its graveyard with Lesson cards without asking you to reanimate anything: the counters, the scry, and the Earthbend animation are all upside layered on a body that already stands at 4/4. Earthbend is the mode with the most teeth, converting a land into a hasty attacker that carries its own resilience clause, so a removal spell or exile answer just returns the land to the battlefield rather than costing you a mana source. The result punishes interaction from two directions: kill the animated land and it comes back tapped, chump the enlarged body and you've traded down. What holds it in check is the timing. Every mode fires on the enters trigger and nowhere else, so all the value is front-loaded into the moment it resolves; there is no repeatable engine here, just one large, self-selecting swing whose size you've paid for in graveyard construction beforehand. Build the yard first, then cash it in all at once.