It seems to me that in the GAT mirror your opponent can just play their draw spells during their turn
That's usually a good thing, having the other GAT player use their mana on
his turn.
and then use its counter magic to protect their bombs.
Which might leave your bombs unimpeded. In a deck with 4 Merchant scrolls and 4 copies of Gush, is it going to be that hard for you to find a bomb of your own?
Consider the Ancestral Recall counter-war most GAT decks will have: If you have this enchantment in play(or even 2) you will cast Recall on your turn and after protecting it(or losing it) you will most likely have betweeen 4-12 damage coming at the opponent next turn. I'm not saying this scenario definitely warrants its inclusion, but it seems like a good fit in the Aggro-Control deck that is GAT.
One of the things that stands out to me about this though, is that it's a tribal enchantment... people seem to be aiming to play Goyf in said Root Maze/Teeg deck, and this makes him even bigger, as well as forcing blue to a semi-Sorcery speed.
Good eye on the Tribal, I noticed it but forgot to mention it. I still am unsure if even a G/W Teeg + Goyf deck would want these main. If you were playing at the TOP tables at a tourney(mostly U-based) then hell yeah, it would be great. Against Gobbos/Stax/Ichy/Etc......not so hot MD. But don't let my skepticism stop anyone, try putting 3 of them in a deck, that's not too many dead slots. Don't forget that a Bazaar based G/W/X deck(Riftstone Portal anyone?) could filter this out and pump up the Goyf.
The GAT mirror isn't about creatures, so this card would have a negative impact in that match. The effect is also conditional giving the opponent a choice (cards that give an opponent the choice are usually aweful in T1, barring Gifts Ungiven).
True, but aren't creatures the win condition? Maybe this card *could* make aggro a bit more important post SB? I don't know. You are right about choices being bad, but again, the choice is: Spend mana on my turn or spend mana on opponents turn. This might make them a little more vulnerable if they tap out on their turn. But it certainly is debatable. I have my own doubts. Does anyone else think this card will see any play at all?
This card sucks.......Hidden Gibbons sucks and this card is no better.
So that puts you in the 'a' category. Gotcha. For the record, Gibbons will only give you ONE 4/4, although I do admit that I have always enjoyed the flavor text on that card.