Serra the Benevolent is a mythic Legendary Planeswalker — Serra card from Mystery Booster 2 (MB2), collector number 17. Current market price: $2.91, TCGplayer market prices via Scryfall.
+2: Creatures you control with flying get +1/+1 until end of turn. −3: Create a 4/4 white Angel creature token with flying and vigilance. −6: You get an emblem with "If you control a creature, damage that would reduce your life total to less than 1 reduces it to 1 instead."