Suspicious Detonation is a common Sorcery card from Murders at Karlov Manor (MKM), collector number 145. Current market price: $0.09 (foil $0.14), TCGplayer market prices via Scryfall.
This spell costs {3} less to cast if you've sacrificed an artifact this turn. This spell can't be countered. (This includes by the ward ability.) Suspicious Detonation deals 4 damage to target creature.