Airtight Alibi is a common Enchantment — Aura card from Murders at Karlov Manor (MKM), collector number 149. Current market price: $0.18 (foil $0.06), TCGplayer market prices via Scryfall.
Flash Enchant creature When this Aura enters, untap enchanted creature. It gains hexproof until end of turn. If it's suspected, it's no longer suspected. Enchanted creature gets +2/+2 and can't become suspected.