Platypus-Bear

A wall built to unlock itself. The defender keyword pins the 2/3 down as a blocker, but the enter-the-battlefield mill of two seeds the exact condition that lets it swing: a Lesson card in the graveyard, and the body starts attacking. Most defenders with an attack clause pay an external toll to shed the keyword, tapping a resource or spending mana each turn; this one loads its own key on arrival, so the trigger that fills the graveyard also pushes toward its own relevance in combat. The gamble is that the mill is blind. Whether the switch flips depends on what sits atop your library and where the two cards land, so the creature can just as easily stay a stationary chump as become a live threat. It reads as three things stacked on one axis: a defensive body, a conditional beater, and a small graveyard engine, all pivoting on what ends up in the yard. Anchoring the condition to the Lesson family rather than a generic graveyard count is the wrinkle that gives the design its teeth, tying its aggression to a specific subtype instead of handing it free upside on a two-drop.