Tap ability could probably go. I'm more interested in the Kentaro, the Smiling Cat ability.

I like both of these effects. I don't mind much whether they're on the same card or separate cards :)

I'd actually be in favour of the Kentaro ability being on a 2-colour card not a 3-colour one, to make it more useful.

Good point. I had this in , and then I realized people would probably want to play it as an EDH general, and that there aren't many flying green creatures. I also realized the ability would be more useful in 3-color EDH than 2-color, which is funny, because it would be more useful as a 2-color creature in normal Magic.

Oh, heh, good point.

Hmm, if this block was including hybrid that'd be an argument for giving this guy a hybrid cost...

Perhaps this guy's ability could apply to himself? "You may spend mana as though it were mana of any colour to cast ~"?

I definitely like the concept of applying the ability to the creature itself, it makes it more immediately exciting, but as-is, that would just be equivalent to making it cost 3.

Could it be an more Aer-specific "any colour" ability, eg. something that somehow works if you have three colours of mana, but it doesn't matter which three? That embraces multicolour-ness, although it still has the problem that the mana cost written on the card isn't really accurate.

May I suggest "~ is all colors."?

That would give you the flexibility to make it cost CD, but also allow for a wider range of choices in Commander...

I feel like we're overcomplicating this now.