Mesmeric Sliver Foil

Creature — Sliver

All Slivers have "When this permanent enters, you may fateseal 1." (To fateseal 1, its controller looks at the top card of an opponent's library, then they may put that card on the bottom of that library.)

"Wait, where am I? Who am I? And what are you?" —Skyshroud secretkeeper, last words