Mesmeric Sliver

Creature - Sliver 2/2, 3U (4)
All Slivers have "When this permanent enters the battlefield, you may fateseal 1." (To fateseal 1, its controller looks at the top card of an opponent's library, then he or she may put that card on the bottom of that library.)¹
Illus. Michael Bruinsma

Gatherer Card Rulings [Nov 2009]

• 5/1/2007: This ability triggers when Mesmeric Sliver itself enters the battlefield.

Format Legality	Legal in Vintage, Legacy, Extended, MTGO Classic Banned in Standard
Printings (1/9)	Future Sight (Common)