A'keem, the Trade King

Haste
Protection from artifacts.
A'keem, the Trade King enters the battlefield with X
+1/+1 counters, where X is the number of artifacts
you control.
When A'keem, the Trade King enters the battlefield,
you may exchange control of target artifact you
control and target artifact you don't control. If you
don't, deal X damage to each opponent, where X is
the number of artifacts you control.