Ahkahitus, Robot Warlord

Eminence - Whenever an artifact you control
leaves the battlefield, if Ahkahitus, Robot
Warlord is in the command zone or on the battlefield, you may exile the artifact. Return it to
the battlefield at the beginning of the next end
step.
Lifelink
{p/w}{p/u}{p/b}{p/r}: You may sacrifice any number of
artifact cards. Draw X cards and gain X life,
where X is 2 plus the number of artifacts
sacrificed.