Reveka, Arcane Maven

{t}: Reveka deals 2 damage to target creature.
{r}, {t}, Exert Reveka: Reveka deals 3 damage to
any target. (An exerted creature won't untap
during your next untap step.)
Whenever Reveka deals damage to a creature, tap
that creature and it doesn't untap during its controller's next untap step.
Whenever Reveka deals damage to a player, that
player skips their next untap step.