Undying Malice

For one black mana, a creature buys a single guaranteed return trip, and the cleverness is in how much that return trip covers. Because the granted ability triggers on death (not on leaving the battlefield to any zone), it plays three roles at once: protection against a kill spell, a value multiplier on a sacrifice outlet, and a combat blowout. Point it at your attacker before combat and any trade comes back larger; hold it against targeted removal and the answer whiffs into a reanimation with a +1/+1 counter waiting. Its instant speed does the heavy lifting, letting you respond in the exact window a threat resolves against your creature, where a sorcery-speed rebuild would arrive a turn late. It also folds into any deck that wants creatures dying on purpose, since the counter plus untapping the following turn converts each sacrifice into a slightly bigger board rather than a break-even shuffle. The tapped clause is what stops this from being an unconditional shield: the creature returns unable to block, so you protect your position without profiting twice in a single turn. It sits alongside older undying-granting effects but swaps their permanence for flexibility, letting you choose the target only once the threat is already on the stack.