Watermark: Set Symbol Illustrated by Chris Rahn Standard Not Legal Alchemy Not Legal Pioneer Not Legal Historic Banned Modern Not Legal Brawl Legal Legacy Legal Comp
You can't use them in most casual games, for that matter
Meanwhile, Oblivion Ring gives us a main deck answer to non-creatures like planeswalkers, artifacts, and enchantments, and works well with Flickerwisp, since we can exile something in the early game and then, if our opponent plays a bigger threat later, reset the target by exiling it and returning it to the battlefield
You can use it to save your Commander at instant speed and a three cost to equip later isn't that much of a tax like these normally have
With a shift of three, Kida can get into the game early thanks to both her Atlantean and Royal Warrior variations