Oath of the Flamepact

Adamantine (This permanent can't be destroyed and can't get counters.)
{c}{r}{c}{b}, {t}: Untap all creatures you control. After this main phase there is an additional combat phase followed by an additional main phase. Activate this ability only any time you could cast a sorcery.
This dagger was forged by the three divinities of Ravnica. Sealed inside, a vow of truce between the guilds, and vigilance to the greater threat."