Game of Chaos is a rare Sorcery card from Ice Age (ICE), collector number 186. Current market price: $12.77, TCGplayer market prices via Scryfall.
Flip a coin. If you win the flip, you gain 1 life and target opponent loses 1 life, and you decide whether to flip again. If you lose the flip, you lose 1 life and that opponent gains 1 life, and that player decides whether to flip again. Double the life stakes with each flip.