Lava Serpent

Cycling exists to fix exactly the problem this body creates: a 5/5 with haste for six mana is a real threat when the board has stalled and a stranded brick when you are stuck on lands and cannot afford to cast it. Rather than sit dead in hand, the card offers a second identity for two mana and a discard, so the top end you drew too early becomes a fresh card instead. The structure is old (creatures with cycling have been a common-slot fixture since the mechanic first appeared), but the specific tuning is what matters here. Haste is what makes the front half worth anything: a vanilla 5/5 landing on turn six rarely turns a game, while a 5/5 that swings the turn it arrives can punish a stumble or win a race. The two-mana cycling cost sits at a middle tier, cheap enough that pitching it early costs you almost nothing, expensive enough that you rarely cycle it on reflex. What you get is a creature that never truly clogs your hand: early it smooths your draws, late it is a hasty finisher demanding an immediate answer, and the choice belongs to whoever is holding it on the turn the decision comes due. That flexibility is the whole pitch, and it is why this shape keeps getting reprinted in aggressive red: the floor is a card, the ceiling is five hasty damage.