Lerrr, Demolition Expert

Whenever a nontoken artifact enters the
battlefield under your control, create a number of tapped Treasure tokens equal to that card's
mana cost.
Whenever one or more nontoken artifacts you
control leaves the battlefield, you may discard
a card. If you do, draw a card.
{t}, Sacrifice X artifacts: Lerrr, Demolition Expert deals X damage to any target.