The Reins of Unity

Target creature you control becomes an equipment artifact creature. Then equip it to any other creature you control. When either creature dies or the equipment creature is otherwise unequipped, the equipment creature returns under your control as a creature.

Equipped creature gains power and toughness equal to its
equipment creature, and gains all abilities within the body
copy of the equipment creature.

After equipping, gain life equal to the combined CVC of
these two creatures.