Board Thread:Show-Related Questions and Answers/@comment-25926288-20150102185627

But who pays it? The caster or the recipient? Why only Dark Magic? Or is this simply Rumple's saying that he spread around?

Dark Magic, usually curses and major spells, seem to require ingredients, special items, or magical energy. For example, the spell of shattered sight required mirror shards infused with dark magic. The curse of the empty hearted requires chimera blood, dragon's something, and the heart of the one you hate most. Fireballs, protection spells, immobilization, and telekinesis likely use energy. But where's the price? It costs these ingredients, time, and energy, but seems to not exact a price on the caster. 