The Thief

At the beginning of your upkeep if there are five
or more artifacts in graveyards or on the battlefield, unveil this identity is you can then,
return all artifacts from all graveyards to the battlefield and gain control of all artifacts.
At the beginning of your end step if you control
20 or more artifacts, you win the game.
Sacrifce a nontoken artifact: Create two Treasure tokens. Activate this ability only once each turn
and only on your turn.