Zaxara, the Exemplary [Secret Lair Drop Series] D4 Whenever a creature an opponent

Whenever a creature an opponent controls dies

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Set: The Lord of the Rings: Tales of Middle-Earth Type: Legendary Artifact Rarity: Mythic Cost: {4} Indestructible

and some are just silly

Zaxara, the Exemplary [Secret Lair Drop Series] D4 Whenever a creature an opponentSet: Secret Lair Drop Series Type: Legendary Creature Nightmare Hydra Rarity: Mythic Cost: {1}{B}{G}{U} Deathtouch {T}: Add two mana of any one color. Whenever you cast a spell with {X} in its mana cost, create a 0 0 green Hydra creature token, then put X +1 +1 counters on it.