Bonescythe Sliver (Duels of the Planeswalkers Promos) [Duels of the Planeswalkers Promos 2013] Archenemy If Cosmic Horror is destroyed

If Cosmic Horror is destroyed this way

{T}: Put a mire counter on target non-Swamp land

Set: Aether Revolt Prerelease Promos Type: Legendary Artifact Rarity: Mythic Cost: {6} Whenever Gonti's Aether Heart or another artifact enters the battlefield under your control

Whenever a player wins a coin flip

Set: Amonkhet Invocations Type: Sorcery Rarity: Mythic Cost: {1}{B} As an additional cost to cast this spell

Bonescythe Sliver (Duels of the Planeswalkers Promos) [Duels of the Planeswalkers Promos 2013] Archenemy If Cosmic Horror is destroyedSet: Duels of the Planeswalkers Promos 2013 Type: Creature Sliver Rarity: Rare Cost: {3}{W} Sliver creatures you control have double strike. (They deal both first strike and regular combat damage.) "Their appendages are sharper than our swords and quicker than our bows." Hastric, Thunian scout