Siren's Call [Alpha Edition] Rivals of Ixalan the ankle stone is connected

the ankle stone is connected to the leg stone

Return those cards to the battlefield under their owner's control at the beginning of the next end step

a 'poem of sand' was of little account

Set: Eldritch Moon Type: Legendary Creature — Eldrazi Rarity: Mythic Cost: {13} This spell costs {1} less to cast for each card type among cards in your graveyard

You start the bidding with a bid of 1

Siren's Call [Alpha Edition] Rivals of Ixalan the ankle stone is connectedSet: Alpha 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.