Tezzeret the Seeker is a mythic Legendary Planeswalker — Tezzeret card from Secret Lair Drop (SLD), collector number 1619. Current market price: $29.01, TCGplayer market prices via Scryfall.
+1: Untap up to two target artifacts. −X: Search your library for an artifact card with mana value X or less, put it onto the battlefield, then shuffle. −5: Artifacts you control become artifact creatures with base power and toughness 5/5 until end of turn.