The Lion-Turtle

A three-mana rock stapled to a 3/6 body that gains you three life, and for a long stretch of the game that is all it is: a color-fixing producer that can neither attack nor block until the graveyard condition is met. That inertia is the point. The Lion-Turtle stays out of combat entirely (vigilance and reach are printed for later, not now) and simply sits there ramping and fixing while you do the real work of stocking three or more Lesson cards. The combat clause inverts the usual mana-dork arc. Most ramp creatures are disposable once the deck comes online, front-loaded value you'd happily sacrifice; this one hoards its payoff on the back end. Once the yard holds its three Lessons, the wall you've been ignoring unlocks into a genuine threat that keeps producing mana while it swings, both taxed with vigilance so it never chooses between offense and defense. The Lesson requirement earns its keep by demanding a deck actually built to fill the graveyard with Lessons rather than a pile that just wants a fixing body. The result reads as two cards occupying one slot: early, an inert utility piece that ramps and buys a life buffer; late, a payoff that arrives with no extra investment, because it was already on the board earning its keep in other ways.