Cantankerous Keepers is a rare Creature — Elf Soldier card from The Hobbit (HOB), collector number 122. Current market price: $0.23 (foil $0.28), TCGplayer market prices via Scryfall.
Affinity for Elves (This spell costs {1} less to cast for each Elf you control.) When this creature enters, mill four cards, then put all Elf cards from among them into your hand.