Skeletron Prime

Flying, Trample, Improvise, Vigilance
When this creature enters the battlefield, create a
5/1 Colorless Flying, Trample Hammer Limb, a
1/3 Colorless Flying, Double Strike Vice Limb, a
2/5 Colorless Flying, Vigilance Bomb Limb, and
a 1/3 Colorless Flying, Triple Strike Laser Limb.
As long as a Limb is on the battlefield, this
permanent has Hexproof, and takes 2 less damage
from any source.
When all limbs leave the battlefield, flip this card.