This card would either be unused or way powerful. Like SoI, its mostly useless in conventional decks, but if you build a deck just for it, its pretty damn powerful. There would be no reason to include this in a normal deck IMO. Rainbow alternative to SoSer maybe? But other than that it wouldn't work out.
Put it in its own deck however, and BAM, its just killer.
6*this + 6*horned frog + 18 life pillars + entropy mark = super-mito-adrena-heal-frogs
Or in mono like keeps said
But the most OP of all, . A hell load of poison, plagues, aflas and most importantly SoSac is just incredible
Hmm... I think shards would probably be exempted. I concieved this card as operating like SoSe wrt. the kinds of spell cards it would provide (i.e. SoSe cant give you shards, so this card would not either).
I suppose you may have a point that this wouldn't see heavy use in conventional decks... Although I would probably include one or two for no other reason than to provide slight protection against nightmare.
It is also fairly useful in providing a means of gaining more pillars in a pinch, so maybe it could see use in mitigating bad draws a little.
The main use I saw for it (outsided of decks centered around it) was to give players a means of swapping out cards when they don't need them.
For instance, suppose I have a deck which uses chaos powered otyughs and fallen elves to eat enemies but I come up against an aether deck that has all immaterial creatures. I could start trading out otyunghs and / or elves in hopes of finding more useful spells (i.e. butterfly effects, or blackholes to pair with discord)
Is this enough to keep it useful or would it be too situational?