Yuwan, Rebel of Fate

Vigilance,
Artifact creatures you control get +1/+1 and Vigilance.
{4}: Target Artifact becomes an X/X artifact
creature where X is the number of artifacts you control.
Whenever you draw your second card each turn, Yuwan, Rebel of Fate deals damage to any target
equal to the number of artifacts you control.
"I'll hunt the keepers until my dying breath, until every
last one of them is erased from existence."