Vyth Interplanar Emissary

+2: Search your library for a Sliver card and exile it, then shuffle your library and create 2 1/1 Sliver creature tokens.
-4: Put a sliver card exiled with Vyth Interplanar Emissary onto the battlefield from exile.
-12: Search your library for any number of Slivers and put them onto the battlefield, then shuffle your library.