Thundermane Dragon

Card advantage that filters itself by fatness: the top-of-library engine only unlocks for creatures with power 4 or greater, which rewards a curve built on Dragons and other heavyweights rather than a grab-bag of value bodies. That power threshold is what pays for the effect, keeping it off the wide-open ground that a generic top-of-library engine would occupy. The passive peek is free information every turn, but the payoff clause only fires when the top card is a threat worth casting, and it sweetens that cast with haste, turning a topdecked bomb into an immediate attacker rather than one summoning-sick for a turn. The build-around tension is real: you want the top of your library stacked with qualifying fatties, which means running fewer of the small support pieces most decks lean on, and accepting dead peeks when a two-drop or a land stares back. Note what the haste rider does not do. Creatures cast this way still follow their normal timing, so a bomb without flash waits for your main phase, and even a flash creature can only attack during your own declare-attackers step; the haste removes summoning sickness on your turn, it does not open an instant-speed attack window. As a four-mana flyer, the body carries a game on its own; the engine is the reason it exists, and that engine only sings for a deck whose creatures all clear the power bar it cares about.