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Exception #3 - Twisted miscuts

A lot of balance and care goes into choosing the cost of a card, more than I can express here, but looking for similar effects on existing Magic cards can give you an idea of a fair costfor example, a ramp spell that puts two lands into play ought to cost 4 mana, per Explosive Vegetation

With Fangorn in play, unspent green mana doesn't disappear as phases and turns end, bypassing the main limitation of adding mana to the mana pool

Originally, we only have Arixmethes' replacement effect to apply -- Winding Constrictor can't apply first because there aren't any counters yet

In fact, one could argue that Rule 0 encourages house rules