Karn, The Superior King

Whenever a non-artifact creature dies under your control, return it to the battlefield as a 3/3 and it
is an artifact creature in addition to other types. Artifact creatures you control may tap for {u}, Humans you control gain a +0/+3 and First.
{t}{c} add X additional {c} to your mana pool,
where X is other artifacts you control.
"I was destroyed by Ulamog, buried here, I must
regained my ability to continue the multiverse, and I
must take this world over to do so." -Karn