Gem of Becoming is a uncommon Artifact card from Magic 2013 (M13), collector number 205. Current market price: $0.22 (foil $1.13), TCGplayer market prices via Scryfall.
{3}, {T}, Sacrifice this artifact: Search your library for an Island card, a Swamp card, and a Mountain card. Reveal those cards, put them into your hand, then shuffle.