Z-Metal Tank

Union Equip {1}: You can Equip Z-Metal
Tank to a artifact creature you control.
The equipped creature gains +1/+1 and
has indestructible.
Union Fusion{3} Sacrifice 3 artifact creatures :
Create a token named XYZ-Dragon Cannon
When Z-Metal Tank enters the battlefield,
search your library for a artifact creature with converted cost 3 or less and add it to your hand.