Defossilize is a uncommon Sorcery card from The Lost Caverns of Ixalan (LCI), collector number 103. Current market price: $0.16 (foil $0.24), TCGplayer market prices via Scryfall.
Return target creature card from your graveyard to the battlefield. That creature explores, then it explores again. (Reveal the top card of your library. Put that card into your hand if it's a land. Otherwise, put a +1/+1 counter on that creature, then put the card back or put it into your graveyard. Then repeat this process.)