With the ability to slow any game down to a crawl, taxation effects give you some breathing room to build your board and survive for a bit longer
Though the mana cost of this Elf Druid from Adventures in the Forgotten Realms is stiff for a multicolored deck, most Elf decks will likely be mono-green, even Commander decks
This mechanic probably wont make it to paper because theres too much tracking involved
Of course, our discussion here is limited by the fact that Wizards doesn't release sales numbers, so perhaps Wizards has some data showing that Iconic Masters , despite the complaints from local game stores and despite boxes "selling" for $120, was a smashing success, or perhaps Wizards makes more money by keeping Masters- set boosters at $10 even if they sell poorly
Wrap Up Alhammarret's Archive | Illustration by Richard Wright This has been a short list, but hopefully with large insights for you