Finest Hour is a rare Enchantment card from Commander 2018 (C18), collector number 180. Current market price: $0.89, TCGplayer market prices via Scryfall.
Exalted (Whenever a creature you control attacks alone, that creature gets +1/+1 until end of turn.) Whenever a creature you control attacks alone, if it's the first combat phase of the turn, untap that creature. After this phase, there is an additional combat phase.