Needs P/T.

sorry, thought I'd put it in

Doesn't seem green at all. Am I missing something?

I think the Green is a callback to Mystic Snake and its Ilk, a Creature/counter. He could probably get away with this being mon blue though.

This is just Disruptive Student + Daring Apprentice, so yes, seems monoblue to me.

Imaginary scenario #1:

I play Sign in Blood. You groan, but only activate the first ability, countering it unless I pay . I let the card get countered and follow it up with Day of Judgement, leap to my feet and start high-fiving everyone in the building. Ronald McDonald then busts through the front door and starts passing out Happy Meals for everyone!

@ jmgariepy - yes, but you would only use the first ability if the caster only had one or no extra mana available.

To make this fit better into I am thinking of making this more like Mystic Snake a-la:
Selachi Spellbreaker -
Creature - Merfolk Mystic [1/1]
Flash
When Selachi Spellbreaker enters the battlefield, counter target spell unless its controller pays .
­, Sacrifice Selachi Spellbreaker: Counter target spell.

This way it is a "Disruptive Snake" + Daring Apprentice. Better fit for blue/green that way?
I think I could drop it to or even then.

Counter two spells for 3 mana? That would be one heck of a strong card. It wouldn't be all the time, but if you had this ready on round three, you'd almost always be able to counter the next spell your opponent played.

If you gave the sac ability a mana cost it wouldn't be so bad.

leaving it at where it is pretty much OK. It can maybe counter the first spell you use it against but then has to wait to lose summoning sickness before you can use it again. Plus, you can't gain access to the second ability until you cast it & you can't cast it unless there is a spell to counter as the first ability isn't a "may" ability.

Camruth's last sentence is incorrect. You can cast the creature on an empty stack, since it's a creature with flash. The ETB trigger will fail to trigger since it'll have no targets, but you're allowed to cast the creature, just like you can cast Nekrataal on an empty board.

You are most correct Alex - been a crazy hectic week. I was refering to a discarded version that had the text "If you play ~ with Flash, counter target spell unless its owner pays . If there is no legal target, ~ goes to the graveyard instead of entering the battlefield.
Was far too clunky/wordy for it to work and I didn't want this to be an instant that gave you a token with the 2nd ability.