Basilica Guards is a common Creature — Human Soldier card from Ravnica Remastered (RVR), collector number 7. Current market price: $0.31 (foil $0.33), TCGplayer market prices via Scryfall.
Defender Extort (Whenever you cast a spell, you may pay {W/B}. If you do, each opponent loses 1 life and you gain that much life.)