Gibber. Brainstorm with convoke. Gibber.

Collaborate should work like the type convoke spells Chord of Calling and Return to the Ranks, yes. That was never my intention, but rather how the ability manifested after trying to create a mechanic based on artistic collaboration from a top-down perspective.

Perhaps the cost needs to be increased, and for this card at least a second blue mana should be included in the cost since one is probably too splashy. Unlike non- convoke spells the mana isn't ever being reduced, so collaborate can only gain bonuses if you have creatures to spare. That does go back to what is an appropriate cost based on how many creatures a player would be likely to have out when they cast a collaborate spell. While collaborate could be used on creatures, I believe such would be unnecessary as all likely abilities that could be collaborated (the threat of limited design space is acknowledged on my comments for Inspired Aggression and Ritualistic Orgy) make more sense on instants and sorceries than they do on permanents and that from a flavor standpoint the mechanic makes little sense on (most) creatures.

Hmmm, okay. Conspire seems like a better/simpler? design although the flavor is obviously different. Ghastly Discovery for example?

It's also kinda more in green's balliwick now.

@Vitenka:

That too though IMO that can be loosened for a set if need be.

­Shared Discovery for example.