Watermark: Sultai Illustrated by Karl Kopinski Standard Not Legal Alchemy Not Legal Pioneer Legal Historic Legal Modern Legal Brawl Legal Legacy Legal Comp
Since they're all 2/2s while face-down, it's likely Bane will sweep them all away even if you make X a smaller number
Mono-Blue decks trying something similar with Arcanis the Omnipotent showed up in Standard around the release of Foundations, but never really took off
Drag-to-dock: A floating zone window can also be docked by dragging its title bar over any cell's tab bar a blue highlight shows where it will land
Modern fakes can often pass these tests anyway, meaning you could destroy a valuable, real card for nothing
Outside of playability which as a collector, and not a TCG player, I cannot speak to, though I really ought to get on with learning the game already there are a handful of uniquely striking cards in the set