Helga, Skittish Seer is a mythic Legendary Creature — Frog Druid card from Bloomburrow Promos (PBLB), collector number 217p. Current market price: $7.14 (foil $9.15), TCGplayer market prices via Scryfall.
Whenever you cast a creature spell with mana value 4 or greater, you draw a card, gain 1 life, and put a +1/+1 counter on Helga. {T}: Add X mana of any one color, where X is Helga's power. Spend this mana only to cast creature spells with mana value 4 or greater or creature spells with {X} in their mana costs.