Duel Disk

If equipped creature battles, you can change it
with a non-Duelist creature you control.
Equipped creature gains: "{t}: Target
non-Duelist creature you control fights
target non-Duelist creature you don't control."
Equip Duelist {1} ({1}: Attach to target
Duelist you control. Attach only as a sorcery.)
"You've fought a valiant duel, my friend, and this is
the hardest move I've ever had to make." - Yami Yugi