Visara the Dreadful

Tap to destroy any creature, and the only condition Visara attaches is that the thing being pointed at is a creature. No targeting restriction on artifacts or fliers, no power cap: the gorgon's gaze answers a tiny chump blocker and an opposing bomb with the same indifference, and the "can't be regenerated" rider closes off the one escape hatch a defender might buy with mana. The cost is the body and the tempo. Three black pips on a six-drop is a real color commitment, and the kill is locked behind tap and summoning sickness, so the turn she lands she does nothing but stand as a 5/5 flier with a target painted on her. Survive that window and the math inverts: every subsequent untap trades for one of your opponent's best creatures, and an evasive body that doubles as repeatable removal grinds a creature-based game to dust. The flying matters as much as the activated ability, keeping her relevant on offense while the gaze handles defense and lifting her past the ground blockers she would otherwise have to spend an activation on. This is the gorgon turned into a mechanic: petrification rendered as a tap ability that ignores everything short of indestructibility. Later repeatable-kill creatures refined the rate and shaved the cost, but the clean, near-conditionless destroy on an evasive engine is the template they were refining.