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It could have also been something that reached further back, reprinting older cards from the plane in order to help lower the cost of them in the secondary market

Final Fantasy Through the Ages Foil: Ancient Copper Dragon (0012 - Dragon of Mount Gulg) NM EX VG G Other Versions Customers who purchased Final Fantasy Through the Ages : Ancient Copper Dragon (0012 - Dragon of Mount Gulg) also bought

The advantage here is that you can play more sources of these colors, and choose your cheap spells to match

Theres obviously a mana value restriction on what works here, but Chulane doesnt tap for mana and costs 5 itself, so maybe they meet in the middle somewhere