Droids

Droid - This creature can attach to a non-Droid creature you control as though it were Equipment. As long as it is attached, it is not a creature and grants either +X/+0 or +0/+X to that creature (where X is this card’s power or toughness) yet can still use its abilities. When the attached creature dies, return this card to the battlefield under its owner’s control with attachment tax.