Gift of the Gargantuan is a common Sorcery card from Foundations Jumpstart (J25), collector number 148. Current market price: $0.28, TCGplayer market prices via Scryfall.
Look at the top four cards of your library. You may reveal a creature card and/or a land card from among them and put the revealed cards into your hand. Put the rest on the bottom of your library in any order.