Sivitri, Dragon Master is a mythic Legendary Planeswalker — Sivitri card from Dominaria United Commander (DMC), collector number 43. Current market price: $8.12 (foil $7.62), TCGplayer market prices via Scryfall.
+1: Until your next turn, creatures can't attack you or planeswalkers you control unless their controller pays 2 life for each of those creatures. −3: Search your library for a Dragon card, reveal it, put it into your hand, then shuffle. −7: Destroy all non-Dragon creatures. Sivitri, Dragon Master can be your commander.