Cecil, Baron Fleet Captain

Haste
Darkness - Whenever Cecil attacks, you may pay X life. If you do, Cecil deals X damage divided as you choose among any number of target creatures.

At the beginning of your end step, if 3 or more creatures died this turn, exile Ceil and return him
to the battlefield transformed.

"I guess it's my fate as a dark knight. Soon, I won't even feel any remorse for my actions."