Adeline, Resplendent Cathar is a rare Legendary Creature — Human Knight card from Foundations Jumpstart (J25), collector number 57. Current market price: $2.80, TCGplayer market prices via Scryfall.
Vigilance Adeline's power is equal to the number of creatures you control. Whenever you attack, for each opponent, create a 1/1 white Human creature token that's tapped and attacking that player or a planeswalker they control.