Oblivion Crown

Flash is the wrinkle that turns a fragile combat trick into a real instant-speed threat. An Aura that grants its host a repeatable discard-for-+1/+1 pump is normally a slow, sorcery-speed commitment: you tip your hand a turn early, and a single removal spell two-for-ones you. Casting it at instant speed dodges that telegraph entirely, letting the enchantment land mid-combat or after a blocking decision is locked in, then convert a hand of dead cards into a creature suddenly big enough to push lethal damage through or eat an attacker it had no business surviving. The discard cost is the lever that prices the whole thing: each activation is free of mana but spends a card, so the pump scales with how much hand you are willing to empty and rewards a deck that wants cards in the graveyard anyway. That double duty (a one-creature kill-shot and a discard outlet) is the design idea, and it sits in a black tradition of trading hand size for board impact: where firebreathing typically wants a recurring mana source to feed it, this asks for raw cards instead, then uses flash to spring the conversion at the exact moment it matters most. The effect lives entirely on the enchanted creature, never the team, which is the constraint that keeps a hand-emptying alpha strike from also being an instant-speed board sweep in your favor.