Chance Encounter is a rare Enchantment card from Odyssey (ODY), collector number 182. Current market price: $1.99 (foil $19.61), TCGplayer market prices via Scryfall.
Whenever you win a coin flip, put a luck counter on this enchantment. At the beginning of your upkeep, if this enchantment has ten or more luck counters on it, you win the game.