Walk the Aeons is a rare Sorcery card from Time Spiral (TSP), collector number 93. Current market price: $1.46 (foil $12.99), TCGplayer market prices via Scryfall.
Buyback—Sacrifice three Islands. (You may sacrifice three Islands in addition to any other costs as you cast this spell. If you do, put this card into your hand as it resolves.) Target player takes an extra turn after this one.