Skeletron Prime

When Skeletron Prime enters the battlefield,
create 4 1/2 Arm artifact creature tokens.
At the beginning of each combat step, you
may have each Arm you control gain up to
two of the following until end of turn:
flying, vigilance, lifelink, or +2/+0
Skeletron Prime gets +1/+1 for each Arm you
control.
The air is getting colder around you...