Decay is very doable if you manage to play your first SN. Like I said, play all your Sundials once you can draw. At this point, he has very low damage, even 0. And you need to finish the game asap, more turns are bad.
Against Jezebel and Dream Catcher, this strategy can work or not, but vs Decay, Im sure its better than keep the Sundials in hand. If his combo is going out of control, and you have the Dragon, Mitosis, and 2-3 Shards, also there is no point on waiting for the combo, you wont have the Air quanta. Going postal sometimes can work
Same here, Jezebel got a Gravity Nymph. CHARGE!
I need to train vs Hecate in the trainer, looks like. If I play the HG, he steals it. If I wait, he steals nothing, and steals it when I decide to play it. Argh.
About the SN nerf, I really think this deck will be much more affected than it seems. Several games, you can play a 2nd HG early, just because you chain SNs. And most important, currently you dont need stop drawing because of SNs. Its a very common situation, you draw more than a SN per turn, and just play it so you can draw more, without having to waste Sundials, for example. When this curse of a nerf comes, you need stop drawing, maybe even discard the SN.