The effect of Emerald Medallion is not applied to cards taken from the opponent.
I control Emerald Medallion and Thief of Sanity.
my Thief deals combat damage to opponent & get Growth Spiral.
I cast Growth Spiral. The cost is reduced(its green spell), so it should be one mana. But in fact, neet 2 mana.
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Rezzahan#77802 commented
Growth Spiral costs UG, so that cost cannot be reduced by 1 generic mana, since it has no generic part. Thief of Sanity just lets you spend mana as though it were of any type, but that too, does not change the mana cost of Growth Spiral. You may cast it with any 2 mana of whatever type you have available, but the cost is not generic and cannot be reduced.