Yeah, this card breaks just about every card organizer I've ever seen. "Why would you ever want to have a -3 in a mana symbol?"

It feels kind of like an Un-card. Plus it has no starting P/T

Can you overpay costs? I've a feeling you can't...

It's like using offering with a creature that costs even more then the Patron you're trying to play. The total cost would be negative, but the best you can do is "overpay" with . Likewise, except in the face of cost increases, is identical to (and paid as) .

Hm. OK, that sounds convincing. Although you could alternatively just add rules text "~'s CMC is -1" :) Or even "is 0", depending how often this is fighting 3-power or 3-toughness tokens :)

CMC is a derived value and doesn't like being set directly. It's like saying "The sum of CARDNAME's power and toughness is 5", or "CARDNAME has three creature types."

Never underestimate the power of a gang of four 1/1 tokens...

I've got no particular plans to update the cost field handler to cope with this card, but I am sorry it doesn't work.

I guess if you want to assemble me a symbol like the symbol, I could let it handle that as a special case.

Heh, that was quick work. There you go, . Enjoy.

That's... unusual.