
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.)
Mesmeric Sliver has 2 printings, first in Future Sight (2007). EDHREC ranks it #17,792 among Commander cards. It has 3 official rulings.
Cards that show up in the same decks on EDHREC.