Nicholas Knackle

When Nicholas enters the battlefield, make X colourless Key artifact tokens with "{2}{t},
Sacrifice this artifact: target creature can't be
blocked this turn."
Whenever a non-token artifact enters the battlefield under your control, you may pay {2}. If you do, that artifact becomes an artifact creature with base power and toughness equal to
its mana value until end of turn. It gains haste.
Chaos Crusader