Vyth, Summoner of Swarms

+2: Slivers you control get +1+1 and Haste until end of turn. Create a 1/1 Sliver creature token.
-X: Search your library for a Sliver with converted mana cost X and put it into your hand, then shuffle your library.
-10: You get an emblem with "Sliver creatures you control get +1+1 for each other Sliver you control."