Rashmi, Eternities Crafter is a mythic Legendary Creature — Elf Druid card from Kaladesh Promos (PKLD), collector number 184s. Current market price: — (foil $19.50), TCGplayer market prices via Scryfall.
Whenever you cast your first spell each turn, reveal the top card of your library. You may cast it without paying its mana cost if it's a spell with lesser mana value. If you don't cast it, put it into your hand.