God-Eternal Kefnet can't use certain alternate costs to cast copy
When you have God-Eternal Kefnet on the battlefield and draw an instant or sorcery card and copy it, casting the copy is inconsistent about what alternate costs you can choose. So far I haven't tested many but some work and some don't.
What works:
Sometimes Fires of Invention
As Foretold
Jodah, Archmage Eternal
Cleave cost for spells that have it
Baleful Mastery's discount
What doesn't work:
Tamiyo, Field Researcher's emblem
Omniscience
One With the Multiverse
Sometimes Fires of Invention
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Cheznug#54016
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