Ghalta and Mavren is a rare Legendary Creature — Dinosaur Vampire card from The List (PLST), collector number MOM-225. Current market price: $1.01, TCGplayer market prices via Scryfall.
Trample Whenever you attack, choose one — • Create a tapped and attacking X/X green Dinosaur creature token with trample, where X is the greatest power among other attacking creatures. • Create X 1/1 white Vampire creature tokens with lifelink, where X is the number of other attacking creatures.