Siren's Call [Unlimited Edition] Masters 25 you may cast that card

you may cast that card and you may spend mana as though it were mana of any color to cast that spell

Set: Commander 2011 Type: Creature — Crab Beast Rarity: Rare Cost: {4}{U} Morph {4}{U} (You may cast this card face down as a 2/2 creature for {3}

"now you will pay for your treachery

beast to soil / until I am everywhere

Siren's Call [Unlimited Edition] Masters 25 you may cast that cardSet: Unlimited 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.