Venser, Riptide Intern

+1: Create a 3/3 Sliver artifact creature.
-3: Name a creature type. Creatures you own are that type in addition to their other types EOT(this is true for library, hand, yard, and battlefield)
-7: Emblem with "Whenever a Sliver you control dies you may search your library for a Sliver with lesser CMC, may put it onto the battlefield."