Metalsmith Elite Killer

Metalsmith Elite Killer costs {1} more fore each
non-artifact creature you control.
{x}{t}: Deal X damage to target creature of planeswalker. You gain life equal to the number
of damage dealt.
When attacking chose one of the folowing:
•Metalsmith Elite Killer gains first strike
•Metalsmith Elite Killer gains menace
•Metalsmith Elite Killer gets a +1/+1 for each
other attacking artifact creature until end
of turn.