Having a hard time getting the Fairy Dust for last Amplification, lol. Any tips on how to get combos high (or why some of the drops are super rare)?
Fairy dust is kinda rare yeah. There are a few tricks yeah, destroying shapes and casting spells doesn't increase the combo but it does reset the combo timer, this allows you to keep the combo going while the grid is refilling. I also recommend the chain spell which increases the combo by 1, you can get it in the shop.