Foster is a rare Enchantment card from Mercadian Masques (MMQ), collector number 247. Current market price: $0.54 (foil $19.35), TCGplayer market prices via Scryfall.
Whenever a creature you control dies, you may pay {1}. If you do, reveal cards from the top of your library until you reveal a creature card. Put that card into your hand and the rest into your graveyard.