Thoughts on Armageddon, Skullclamp, Entreat the Angels and Mind Twist? These are some of the biggest culprits ruining games in my cube these days. I have been thinking of adding another Brainstorm, really can't justify it with Entreat around. I do feel, however, that Terminus is an acceptable Miracle effect that is an alternative to Balance, requires set up and does something significantly different than normal Wraths.
One of the thing R&D talks about is using CC cards (with double color requirements) to ensure that the decks that need that effect actually get them. With Armageddon, very often I will be playing another color combination, see the card and without thinking be like "I guess I'm playing white too." Not great for the draft dynamic.
Balance is so easy to use. Basically, if you're playing control, you turn your worst cards into your hand into free spot removal spells. So, if they have 3 creatures, you pay 1W and 3 cards (including Balance) to kill all of them. Meanwhile, they had to pay a lot more than 1W for those creatures they put on board. That's with no set up whatsoever. Costing 2 mana also means it's pretty much immune to mana denial effects, which aggro decks rely on to prolong the early game.
Demonic Tutor is much more reasonable without the presence of totally bonkers spells. It can be a really fun card to cast in normal decks in relatively normal board states.
Land Tax is a strange card. It's in my cube, but it's not really promoting any strategies or anything. If somebody asked me why it was there, I wouldn't really have an answer for them.
This is something I'm currently struggling with. In my early cubing I felt real pressure to power maximize, but I've seen firsthand that leads to some terrible results. This is also one of the double-edged swords of cube design. Yesterday one of my drafters told me that his friend wouldn't come to draft because cubing is just "lame stuff like Tinker + Blightsteel". However, "awesome cards" is a legitimate selling point that gets people in the door the first time. Some people who haven't cubed are a bit disappointed if they hear I don't support Eldrazi or Storm or whatever. But chances are, if I did, they wouldn't stick around for long anyways. It's a major motivation of my writing, to help shape a Magic community that thinks about cubes differently than what the existing narratives have provided.
The truth is there aren't really many good examples out there. We're on the frontier, and I'm making a ton of design mistakes. It's expensive too! Not the most fun to shell out for a card like Entreat the Angels, only to find out a couple drafts in that it does nothing but randomly ruin games.