Lose Focus is a common Instant card from Modern Horizons 2 (MH2), collector number 49. Current market price: $0.30 (foil $0.38), TCGplayer market prices via Scryfall.
Replicate {U} (When you cast this spell, copy it for each time you paid its replicate cost. You may choose new targets for the copies.) Counter target spell unless its controller pays {2}.