Siren's Call [Limited Edition Beta] Magic 2014 that creature gets +1/+1 until

that creature gets +1/+1 until end of turn

When Cyclopean Tomb is put into a graveyard from the battlefield

At the beginning of your upkeep

The Multiverse was my plaything

Siren's Call [Limited Edition Beta] Magic 2014 that creature gets +1/+1 untilSet: Limited Edition Beta Type: Instant 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.