Real World Examples don't always equal Elements Examples.
This would be powerful in a rainbow - even if the spell costs very little you could recycle that quantum to play other cards in your deck, and if you're just playing more spells like bolts, Miracles, etc, you're definitely not losing much quantum at all if your deck is very well built. It might be better if it only gave half the quantum, rounded up - this slows down the recycling loop that could happen in a rainbow.