The Aesir Escape Valhalla is a uncommon Enchantment — Saga card from Assassin's Creed (ACR), collector number 39. Current market price: $0.29 (foil $0.35), TCGplayer market prices via Scryfall.
(As this Saga enters and after your draw step, add a lore counter.) I — Exile a permanent card from your graveyard. You gain life equal to its mana value. II — Put a number of +1/+1 counters on target creature you control equal to the mana value of the exiled card. III — Return this Saga and the exiled card to their owner's hand.