Hapatra, the Desert Frost is a uncommon Legendary Creature — Human Wizard card from Reality Fracture (FRA), collector number 215. Current market price: $0.18 (foil $0.31), TCGplayer market prices via Scryfall.
When Hapatra enters, for each opponent, tap up to one target creature that player controls. Put a stun counter on each of those creatures. (If a permanent with a stun counter would become untapped, remove one from it instead.) {2}{U}: Untap target creature.