Definitely a nice, idea, but compare the power level to Elvish Piper: this does almost the same thing, but can activate on effectively turn 2 (if it triggers in your opponent's upkeep)? Tweaks previously used for this sort of thing have been: make it target opponents hands only; add a mana cost to the activation; make you discard the card (possibly with replacement, or instead key off a card from the top of your deck)?

I did worry about it being too good, but I hoped the drawback of it revealing your hand to your opponent would help balance it. I also thought that the "downtime" when it's just a 1/1 would make it vulnerable, but there isn't really much of a downtime at all, is there?

I may make this the ability of a legend in Dienoct or one of the following sets.

Revealing your hand is no problem if you are using this guy, because everyone would already see what you're up to. Definitely undercosted.

Also, I think that window where it's 1/1 is a bit unnecessary. Just because of the weird wording.

It was originally "at the beginning of each upkeep" "until end of turn." As it is now, it has a whole turn of weakness before it becomes Emrakul or whoever. I assume it needs a rather high cost to be fair, if that's even possible.

Ah, that's a lot more interesting :)

Thanks. :-)