Primis Deus

(Primis Deus isn't a spell,
It is affected by summoning sickness,
It has " {t}: add {c} to your Mana pool")
{t}: Target creature gains Indestructible and Annihilator 3 for as long as Primis Deus remains tapped
You may choose to not untap Primis Deus during your untap step