Siren's Call [Beta Edition] Nissa Set: Amonkhet Invocations Type: Instant

Set: Amonkhet Invocations Type: Instant Rarity: Mythic Cost: {U} Change the target of target spell with a single target unless that spell's controller pays {2}

You may have that player lose that much life

Set: Champions of Kamigawa Type: Legendary Land Rarity: Rare Boseiju

you may sacrifice an artifact

Siren's Call [Beta Edition] Nissa Set: Amonkhet Invocations Type: InstantSet: Beta 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.