Boros Strike-Captain is a rare Creature — Minotaur Soldier card from Ravnica: Clue Edition (CLU), collector number 25. Current market price: $0.33, TCGplayer market prices via Scryfall.
Battalion — Whenever this creature and at least two other creatures attack, exile the top card of your library. During any turn you attacked with three or more creatures, you may play that card.