If a spell has no mana cost of any sort (not even {0}), then the replicate ability that is created will have no way to pay its cost. [D'Angelo 2006/11/11]
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Would be great if it acually worked but it doesnt.. the orignal cast of the rite of flame/ seething song doesn't resolve till all replicate costs are paid for. thus giving you a limited mana supply instead of a Endless. Meaning you cant use the Mana gained from the First cast to pay for Replicate casts.