Luna, Team Mascot

True Mastery {0} (If you control a full party, you
may cast this for its true mastery cost. Your party
consists of up to one each of Cleric, Rogue, Warrior,
and Wizard.)
At the beginning of your end step, if each
creature in your party is tapped, untap Luna
and each creature in your party.
{g/w}, {t}: Put a +1/+1 counter on target creature
you control.