I haven't actually seen a thread on this bad boy, and though it might not be the best cube card, I think it's well worth the discussion.
Unless your cube has infect, this is pretty much a temporary answer to anything. It protects your entire board, including those flimsy PWs, as well as your life total from anything and your hand from all targeted discard effects.
Notable powerful things this card protects from: Craterhoof Behemoth / Hellrider, Fireblast and the like / Mind Twist / Armageddon / Supreme Verdict, Massacre Wurm and the like/ Sneak attack especially with annihilator, and the list goes on.
There are arguments jumping around in my head comparing this card to Time Stop or Time Walk, and in many of the cases I mentioned the end result is much the same. Having such an effect in white seems amazing.
Last but not least, this card can also used proactively with / in response to Balance in order to cause your opponent to sac their board (though hand sizes are still effected).
Thoughts?
EDIT: there's also some pretty interesting synergy with Gideon Jura.
Biggest strke against this card is that it's floor is basically a 'fourTHREE-mana fog'. Granted, that's the floor but it is pretty atrocious. Barring living the dream, I don't know if it's average use case is good enough. I suspect not. Still--it is probably the most nakedly powerful card they've given white in a long, long time.
A. Three mana. At four mana this card would be much less usable indeed.
B. The average uses I see for this card are:
1. "Countering" a spell targeted to your face or an important permanent, like Mind Twist, Fireblast, Thoughtseize, Vindicate, Plow Under, Strip Mine, Control Magic, etc., as well as the combat afterwards. These are interactions which are rarely playable in white.
2. Making board wipes one sided. Note that it doesn't matter who casts them. It's one of the only cards that can properly answer Supreme Verdict, Upheaval, Balance, Wildfire, but it also combos with them. Other great uses are vs Toxic Deluge, Bontu's Last Reckoning, Rolling Earthquake. It's also simply good vs regular board wipes like ***, Damnation, etc.
3. Protecting yourself vs. lethal with unrivaled efficiency. It protects vs Craterhoof, Emrakul, the Aeons Torn - even when cast (since you're protected until your next turn, even during their extra turn) or any other Eldrazi with Annihilator, Hellrider, and other shenanigans.
Keep in mind that it's a good topdeck - the bare minimum it does is hold the line until your next turn.
I agree with Morphlings assessment that this is basically a fog effect, and not that great for cube unless you cube is FILLED with cards like the ones mentioned by OP. Although you can name many situations where the card can cause blowouts, the same is true for fog, and it's generally better to have a card that can actually do something. I think similar cards like Boros Charm, Heroic intervention and even Unbreakable formation are better in cube, and other than Boros Charm, those aren't great options. It can't even be imprinted on isochron for abuse.
I also think the comparison to time walk is a terrible one. Your opponent still gets to untap their permanents, draw, play lands, ramp, cast any creatures, planeswalkers, artifacts, enchantments, draw spells, etc.. they want to improve their position, and hold up mana for counterspells.
Teferis protections is great primarily because it protects against Cyclonic Rift in commander, which isn't format defining in cube and doesn't really require answers. Hard Pass. Use cards that are more flexible that do other things too like Boros Charm, even if they protect from less situations.
I haven't actually seen a thread on this bad boy, and though it might not be the best cube card, I think it's well worth the discussion.
Unless your cube has infect, this is pretty much a temporary answer to anything. It protects your entire board, including those flimsy PWs, as well as your life total from anything and your hand from all targeted discard effects.
Notable powerful things this card protects from: Craterhoof Behemoth / Hellrider, Fireblast and the like / Mind Twist / Armageddon / Supreme Verdict, Massacre Wurm and the like/ Sneak attack especially with annihilator, and the list goes on.
There are arguments jumping around in my head comparing this card to Time Stop or Time Walk, and in many of the cases I mentioned the end result is much the same. Having such an effect in white seems amazing.
Last but not least, this card can also used proactively with / in response to Balance in order to cause your opponent to sac their board (though hand sizes are still effected).
Thoughts?
EDIT: there's also some pretty interesting synergy with Gideon Jura.
It's an interesting card.
There's definitely some blowout potential.
However, I think reactive cards like this usually play worse than they look.
Not sure if I would play it over some other quirky card like Parallax Wave, although the two are clearly vary different.
360 card powered Chicago cube:
https://cubecobra.com/cube/overview/e7r
2020 Numerical Power Rankings:
https://www.mtgsalvation.com/forums/the-game/the-cube-forum/cube-card-and-archetype/817969-2020-numerical-cube-power-rankings
2018 CubeTutor Power Rankings:
https://www.mtgsalvation.com/forums/the-game/the-cube-forum/cube-card-and-archetype/803301-cubetutor-power-rankings-2018-by-color-and-cmc
fourTHREE-mana fog'. Granted, that's the floor but it is pretty atrocious. Barring living the dream, I don't know if it's average use case is good enough. I suspect not. Still--it is probably the most nakedly powerful card they've given white in a long, long time.Fully-powered 600-Card "Dream Cube" https://cubecobra.com/cube/list/dreamcube
450-Card "Artificer's Cube" https://cubecobra.com/cube/list/artificer
Cubing in Indianapolis...send me a PM!!
B. The average uses I see for this card are:
1. "Countering" a spell targeted to your face or an important permanent, like Mind Twist, Fireblast, Thoughtseize, Vindicate, Plow Under, Strip Mine, Control Magic, etc., as well as the combat afterwards. These are interactions which are rarely playable in white.
2. Making board wipes one sided. Note that it doesn't matter who casts them. It's one of the only cards that can properly answer Supreme Verdict, Upheaval, Balance, Wildfire, but it also combos with them. Other great uses are vs Toxic Deluge, Bontu's Last Reckoning, Rolling Earthquake. It's also simply good vs regular board wipes like ***, Damnation, etc.
3. Protecting yourself vs. lethal with unrivaled efficiency. It protects vs Craterhoof, Emrakul, the Aeons Torn - even when cast (since you're protected until your next turn, even during their extra turn) or any other Eldrazi with Annihilator, Hellrider, and other shenanigans.
Keep in mind that it's a good topdeck - the bare minimum it does is hold the line until your next turn.
I also think the comparison to time walk is a terrible one. Your opponent still gets to untap their permanents, draw, play lands, ramp, cast any creatures, planeswalkers, artifacts, enchantments, draw spells, etc.. they want to improve their position, and hold up mana for counterspells.
Teferis protections is great primarily because it protects against Cyclonic Rift in commander, which isn't format defining in cube and doesn't really require answers. Hard Pass. Use cards that are more flexible that do other things too like Boros Charm, even if they protect from less situations.