I was expecting an entropy card that changes all creatures' element and/or ability cost in a random one. (think about it, it might be better)
I think the main use for this effect would be trolling your opponent. Might not be a bad idea indeed, it would be kinda like a mass lobo that is ineffective against rainbows (I feel it would need a duration to keep it from being too strong)
About the card: I don't really like the idea of letting you play a mono, that's why SoR was changed to time element (I think).
This is the main reason why the effect has a duration (the costs themselves would remain the same, but you would be using your mark to fuel it. After 2 turns all returns to normal)
I would use it in a mono water deck.
I suspect something like this should be tied to an element because the effect seems too special to be a generic effect. Unfortunately this reduces it ability to do your intended goal. (Reduces not eliminates)
Well, from a thematic point of view I think it fits
, but in most cases a supernova would fit the bill.
That was my first idea,too. This would open a new kind of semi-rainbow. Monodeck with splashed in monsters from another element seems pretty cool.
Only the skills are paid of mark. Drake's original idea was doing fused costs (random element, but not random quanta) for creatures and for cards played by hand.
I think I'm approaching this the wrong way. I'll probably keep this name and art but do something completely different (using iancudorinmarian's idea as a starting point) and think of another way to make synergies easier to use.