Raikiri,Atom Slicer

+4: You get an emblem with" Whenever a creature you control is blocked,that creature gets +1/+1 until end of turn for each creature blocking it."
-X: Search your library for a robot creature with CMC X, make 3 token copies of it,put them on the battlefield tapped,then shuffle your library.
-20: Each opponent sacrifices all their creatures, And you gain life equal to the combined total converted mana cost of creatures sacrificed this way.