Trap, Scrap Rat

Salvage —At the beginning of your end step,
create a Treasure token for each creature that
died this turn. (It's an artifact with "{t}, Sacrifice
this artifact: Add one mana of any color.")
Tinker —At the beginning of your upkeep, you
may sacrifice X treasure tokens and create X 1/1
colorless Myr artifact creature tokens, where X
is the number of treasure tokens sacrificed this
way
"Here's how a pro does this."