Repel Intruders is a uncommon Instant card from Shadowmoor (SHM), collector number 147. Current market price: $0.12 (foil $0.44), TCGplayer market prices via Scryfall.
Create two 1/1 white Kithkin Soldier creature tokens if {W} was spent to cast this spell. Counter up to one target creature spell if {U} was spent to cast this spell. (Do both if {W}{U} was spent.)