Sir Ascallon, Conqueror

Haste, First Strike, Trample
Whenever Sir Ascallon deals combat damage to
one or more permanents or opponents, you may
pay {x}{r}{w}. If you do, exile target Creature or Planeswalker with a converted mana cost X or less
until this card leaves the battlefield. Create a
token that's a copy of the exiled card except it is a
Knight in addition to its other types.
When Sir Ascallon leaves the battlefield, exile all tokens created by him.