Shivan Devastator

Fireball with wings. Red has always had X-spells that scale into the late game, but they burn out on cast and leave nothing behind; this one commits the whole payment to a body that flies over blockers and swings the turn it lands. The 0/0 base is the honest part of the deal: without X it dies to state-based actions before anything happens, so every point you pay is both stats and evasion, and the entire mana investment stays on the board as a threat rather than resolving once and going to the yard. That permanence is what separates it from the burn-spell lineage it descends from. A Fireball fizzles into damage and is gone; this arrives as a hasty evasive clock that keeps demanding answers, and the flexibility runs the full curve, a cheap flyer early or a game-ending haymaker when the mana is there. The counters, rather than raw printed power, also mean it plays well with anything that cares about +1/+1 counters or wants a creature that can grow further after resolution. It is the clean expression of a simple red idea: turn excess mana directly into pressure, and make that pressure stick.