These bands show where most cards typically land so you can quickly triage a collection before scanning individual cards for exact prices
While there are more ways to add counters to creatures in Avatar: The Last Airbender, compared to most other sets, Heartless Act can also remove counters from creatures, which gives it a lot of added versatility
While I believe some people have unrealistic expectations on how cheap Magic should be (and we'll talk more about this later), I 100% agree that Magic is too expensive and have dedicated a lot of time and effort to fighting for more and better reprints and the end of the Reserved List
Once the initial wave of M15 hits the prices should settle nicely in the few dollar range, with Shivan Reef perhaps being a tad more than the others thanks to more Modern demand
If you wanted to get diabolical with it, you could play All Is Dust and take control of every single colored non land permanent your opponents control
If Winter Moon is on the battlefield while another effect restricts untapping lands or permanents in a different way, their effects are cumulative