Guise, The Game Jumper

(3): Guise, The Game Jumper becomes a copy
of target creature until end of turn, except its
name is still Guise, The Game Jumper and it
is legendary. "Hey I can do that!"
When Guise, The Game Jumper dies, your
opponents may cheer for its death. If at least one
opponent does not, Guise, The Game Jumper,
costs twice (X) less to cast, where (X) is the
number of times Guise, The Game Jumper has
been cast from the command zone this
game. "Cheering now........thats just rude."