Treasure Keeper is a uncommon Artifact Creature — Construct card from Foundations Jumpstart (J25), collector number 760. Current market price: $0.23, TCGplayer market prices via Scryfall.
When this creature dies, reveal cards from the top of your library until you reveal a nonland card with mana value 3 or less. You may cast that card without paying its mana cost. Put all revealed cards not cast this way on the bottom of your library in a random order.