Need help with Entropy/Aether Deck

[Higurashi]

Elders? All you need against Elders is speed. They don't pack many big creatures, and Antimatter is slow, so it's a horrible fit. Quint is useless, and Aether is slow in general. If you want to win faster and more often, go monoentropy and pack only Abominations, Dragons, two Maxwell's and the rest pillars.
If you want defense, Dimensional Shield is quite enough against Elders, and you will rarely ever use more than 2-3, so pack 3-4. It's not worth making it duo for, though. Not against Elders.

[Nebula127]

Okay, what about T50?

[Higurashi]

Most T50 will have plenty perm control, so either you pack more perms to protect the shields (mainly weapons), or you keep going at sheer speed. When farming T50, it's easier to go for speed, since it will work in most cases. While Antimatter helps there, monoentropy isn't quite fast enough to make a good enough rush, even upgraded. I'd aim for a stronger built, upgraded rush, like Lava Destroyer rush (currently the fastest documented deck there is), but you can certainly farm Elders to make the cash for that goal.

If you want more speed deck ideas, this thread has all the best known ones: http://elementscommunity.org/forum/index.php/topic,8813.0.html
Good hunting.