Well written up, I've been doing the same, especially stacking DEC, although I've only actually managed to maintain that given the cards I've bought rather than increase it.

I think one has to be careful with the summoners - bit too rich for me personally.

maybe some of the maxed legendaries too, good chance to pick up a few gold dragons.

However, I'm just holding out a little bit longer to buy my level 3 Hydra! They're still not selling even after several price reductions.

@tipu curate