Its pulsating cry shatters bonds of iron, granite, and servitude.

Wakestone Gargoyle

Defender, flying
{1}{W}: Creatures you control with defender can attack this turn as though they didn't have defender.

Its pulsating cry shatters bonds of iron,
granite, and servitude.

Tarkir: Dragonstorm Commander

The List

Conspiracy

Dissension

Defender (This creature can't attack.)
Flying
{1}{W}: Creatures you control with defender can attack this turn as though they didn't have defender.

Wakestone Gargoyle’s ability allows itself to attack.

Wakestone Gargoyle’s ability will affect creatures with defender that come under your control after the ability resolves but before you declare attackers (though those creatures still can’t attack unless they have haste).