Siren's Call (Retro) [30th Anniversary Edition] Zombie Assassin you may put Nether Shadow

you may put Nether Shadow onto the battlefield

put it on the bottom of its owner's library

Exile those tokens at end of combat

Whenever a Snake you control deals combat damage to a player

But Yargle was not most living things

Siren's Call (Retro) [30th Anniversary Edition] Zombie Assassin you may put Nether ShadowSet: 30th Anniversary Edition Type: Instant Rarity: Uncommon Cost: {U} Cast this spell only during an opponent's turn, before attackers are declared. Creatures the active player controls attack this turn if able. At the beginning of the next end step, destroy all non Wall creatures that player controls that didn't attack this turn. Ignore this effect for each creature the player didn't control continuously since the beginning of the turn.