Frostveil Ambush
Instant
Tap up to two target creatures. Those creatures don't untap during their controller's next untap step.
Cycling 
(, Discard this card: Draw a card.)
Hunters' methods vary from simple and brutal to elaborate and brutal.
Johan Grenier
Rulings
Frostveil Ambush can target a creature that’s already tapped. That creature won’t untap during its controller’s next untap step.
(wotc • 2020-04-17)
Rulings
Frostveil Ambush can target a creature that’s already tapped. That creature won’t untap during its controller’s next untap step.
(wotc • 2020-04-17)