A strategy I call 'zerg rush': Add a row or two of goldmines to your deck, a couple of iron mines, and a few alchemy. Completely ignore crystals and units which cost them and fill the rest of the space with cheap, mass-produced units (Fresh Skeleton, Forestikn, etc.) Surrender matches until you start with at least 3 gold mines. Play all your gold mines asap. Keep drawing and playing gold mines (and iron) until you have at least 15 income, but start sending 15-gold units at 11 or 13 when the enemy's first units get right next to your portal. Play alchemies as soon as you can. Once you reach 19+ income, you're laughing. Just keep sending those cheap units to overwhelm any opposition.
@CherryAntacid are you using Google Chrome? For me, Unity lags like hell on Chrome. If so, try switching to Firefox. If not, see if you have the latest version of Unity.
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