Okay, this one is pretty sweet actually. Of course you could switch out 2 Rewinds for Eternities, but I wouldn't suggest it. It just makes your dragon speed slower.
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The strategy is simple. Hourglasses come first over a dragon. The reason is you'll need those rewinds and extra towers. Also, your dragons are pretty vulnerable to damage / poison spells, so it's best to have a few handy.
Disclaimer: Everyone's going to have a slightly different win %. Don't bother coming to me after 1 game and saying you have a win % of 0. Skillgannon is not responsible for your bad playing. If you don't know how to think a little before you click a mouse, then just leave.