The "rarest" depends on how you define rarity: pull odds from packs, or total worldwide copies
They are Vrondiss, Rage of Ancients (a Dragonborn Barbarian, leading the red/green Draconic Rage deck), Prosper, Tome-Bound (a Tiefling Warlock, helming the red/black Planar Portal deck), Sefris of the Hidden Ways (a Genasi Wizard, leading the White/Blue/Black Dungeons of Death deck), and, finally, Galea, Kindler of Hope (a Half-Elf Paladin, topping the White/Blue/Green Aura of Courage deck)
Untappers Once we have a sufficiently full collection of Bobbleheads, we can start doubling down on their effects by activating them multiple times per turn
Special & Oversized Pokemon Card Dimensions Beyond standard packs, Pokemon has released several oversized formats for promotions and display
Repeat this infinitely
Another valuable Planeswalker in Midnight Hunt is Teferi, Who Slows the Sunset , which can draw cards, untap permanents, search the library's top three cards for answers, and even gain life