Mercy, Guardian Angel

Flying, Ultimate Charge
{1}: Target creature you control has your choice
of +0/+4 or +4/+0. Only one creature can be targeted by this effect at a time.
{w}{w}, {t}: Return target creature that died this
turn from your graveyard to the battlefield. Put 4 ultimate counters onto Mercy. She doesn't untap during your next untap step.
Valkyrie—{3}{w}{w}, remove 5 ultimate counters
from Mercy: Replace "target" in her
abilities with "each" until end of turn.