Mishra, Pawn of Gix

Whenever Mishra, Pawn of Gix enters the battlefield or attacks, you may exile a artifact card from your hand or graveyard
and put a cage counter on it.
Mishra, Pawn of Gix has all the text of
all artifacts in exile with cage counters (Replace all instances of those card names with Mishra, Pawn of Gix)