Valkyrie's Call is a mythic Enchantment card from Foundations (FDN), collector number 27. Current market price: $1.01 (foil $1.45), TCGplayer market prices via Scryfall.
Whenever a nontoken, non-Angel creature you control dies, return that card to the battlefield under its owner's control with a +1/+1 counter on it. It has flying and is an Angel in addition to its other types.