The Flesh Forge

Creature spells in your hand have "Fuse with
Equipment", it's fuse cost is equal to it's mana value

(Fuse: when you cast this spell for it's fuse cost you
put it on the stack as a creature spell targeting an equipment you control, as it resolves the creature
fuses with the equipment. The Equipment gains "equipped creature has all abilities of creatures fused
to this equipment and gets +x/+x where x is it's
mana value")