Mercy, Guardian Angel

Ultimate: Valkyrie - (Mercy, Guardian Angel enters the battlefield with two charge counters on her. At the beginning of your upkeep, remove a charge counter, then, when the last is removed, creatures you control get +0/+6, gain vigilance until the end of turn. his turn, there is an additional combat phase, then place three charge counters on Mercy.)
{2}{w}, {t}: Resurrect (Return target creature from the graveyard to the battlefield tapped, activate this ability only if a creature died th