Marbeled Soulbound Blade

{t}{2}equip this card onto a creature
when equipped card attack spellboost this turn
for each color you control
you may unequip this card and expend two mana
for this card to become a 2/2 spirit creature
with haste until the end of turn that is still an artifact
the blade chain reacts with the environment and comes
alive to the mana in the air