Mágica Instantânea — Armadilha
Se três ou mais criaturas estiverem atacando, você poderá pagar

em vez de pagar o custo de mana de Armadilha de Letargia.
As criaturas atacantes recebem -3/-0 até o final do turno.
Effects that increase or reduce the cost to cast a Trap will apply to whichever cost you chose to pay.
Casting a Trap by paying its alternative cost doesn't change its mana cost or mana value. The only difference is the cost you actually pay.
You may ignore a Trap's alternative cost condition and simply cast it for its normal mana cost. This is true even if its alternative cost condition has been met.