Transmute Energy

Convoke, Improvise (Your artifacts and creatures can help cast this spell. Each artifact you
tap after you're done activating mana abilities pays
for {1}. Each creature you tap while casting this spell pays for {1} or one mana of that creature's color.)
Untap up to X target artifacts and/or creatures. Draw a card.
In order to obtain something, something of equal value must be lost.