No, no, no! I won't stop having ideas because of this.
I don't want you to stop having them -at all-. Even when an idea could potentially break the game, it needs to pop out so this discussions happen.
I don't want to be harsh either.
You aren't
But here, we create cards concepts and ideas, we make them interesting and balanced as much as possible within the community. Then, the community votes during weeks and between pools of many cards to decide which one should be in the final stage. It's only in the final stage that Devs look at the cards and decide if it's worth being implemented or not. Not before. Now now.
Brainstorming and Ideas cristalisation shouldn't be restrained by what we think will be accepted or not by the devs. It's a counter-creative process to do so. Let the devs do this themselves when it is time to be done, let's avoid presuming what is in their heads and let's allow them to change their minds because of the community's voice.
So unless Zanz comes here and say: "Don't create cards with discard effects... ever." I won't stop having discarding cards ideas! 
Huh, you're right. I guess I expressed myself in a wrong way... I (me) think -and agree with Zanz-, that an effect like this will break the game, making lot of people lose the "safety" sensation of having a card in your hand, thus raging more (this is subconscious, so, unless you actually want to lose, you will hate this). Last time I checked, -when I only lurked
- most of the community was against this effects, unless they were more creative and not so straightforward like "look your opponent's hand, take out one creature".
To respond directly to what you said. The creature is quite weak, I find it hard to be soft-locked by the TTA because of his discarding capacity, and in the worst case scenario, you can play the creatures you draw. In mid game, it's rare to have a hand full of creatures in fact. Most of the time, it's a good idea to play creatures asap in the game. The TTA is strong in combos (Gotp, SoSa, etc), in concepts decks (Death trigger decks), but not by itself alone.
I don't mind if I'm locked by it. If I'm running CCYB, and waiting for a Quint to make my Lava Golem immortal, I'm risking a lot and wasting time to ensure that my Lava Golem will survive, but with this card you can't have that anymore (unless you pack sanctuary in every deck). Rush decks will never be so hardly hit by this, since they use 6 copies of rushy creatures, and just play is ASAP, but stalls get hardly hurt this way (and the LAST thing stalls need is more nerfs, actually, rushes need to be nerfed).
Also, I find it really less fun to be targetted by Nightmare (and to not draw) than to have a creature card discarded in my hand by the opponent (I can still draw). But that's subjective.
Well, I can argue that, at least, I can choose what creature I discard, so the frustration is lesser...
Whatsoever, what I want is to see a more creative effect, nevermind why. If you haven't seen this exactly effect a lot is just because most people look for an alternative to directly discarding, but otherwise, this would be a common effect amongst the CI&A section.
