Do-Over is a rare Instant card from Mystery Booster Playtest Cards 2021 (CMB2), collector number 20. Current market price: $0.26, TCGplayer market prices via Scryfall.
Restart the turn, except with Do-Over in exile. (First, return all cards to where they were as the turn began. For information from hidden zones like the hand, reconstruct as best you can, and do the rest at random.)