Invasion Specialist is a rare Creature — Phyrexian Cleric card from Unknown Event (UNK), collector number RB04b. Current market price: $3.00, TCGplayer market prices via Scryfall.
Battles you control have "-3: You draw a card and lose 1 life." (Activate by removing three defense counters. You control battles you cast, even if an opponent protects them.)