I think it's a decent card that gets better if you're playing Emry, Lurker of the Loch and Lurrus of the Dream-Den and the like.
I'm at 360 with both of those cards, and it also helps me in my quest to try to make delirium a thing, so I'm going to give it a shot.
Here's an example RB delirium deck I drafted that I think would perform very well in cube.
Note that I am able to play Lurrus as a companion in the SB, which is very powerful.
The curve is extremely low and disruptive, similar to current modern Rakdos decks.
Hence, why I consider this a potentially very viable archetype.
An MH2 card that flew under the radar but is making big waves in constructed, Unholy Heat is an efficient removal spell in the same vein as Fatal Push. While the condition is certainly harder to hit, Unholy Heat goes much wider than Fatal Push - once you hit delirium this is almost functionally a single mana instant speed Dreadbore.
Given its medium floor as an early instant speed removal spell and its high ceiling as an instant speed answer to bombs like Primeval Titan, Consecrated Sphinx, Oko, Thief of Crowns and Teferi, Hero of Dominaria, I think this card is a solid role playing cube card consideration that contributes to a growing critical mass for a spells matter / delirium matters aggressive archetype.
This is certainly not a common cube card, but I do see it's usage in cube trending up.
Mishra's bauble has come into its own over the years and is now a modern staple.
More recently, it's been tearing up the modern metagame in Rakdos delirium decks built around Dragon's Rage Channeler and Unholy Heat, which seems to be the top deck at the moment (although the metagame is still relatively nascent). It makes great food for Kroxa, Titan of Death's Hunger and is an efficient card draw engine with Lurrus of the Dream-Den, two other modern staple cards that hold their own in cube.
But beyond that, it's also a free card selection cantrip with any fetchland or shuffle effect - this is extremely powerful in both constructed formats like Modern as well as cube, as anyone who's played Preordain can attest. Because of this, I actually think the card is most viable in 360 cubes where fetchland density is highest.
But even in monored, can be very sweet. Admittedly, it's harder to hit delirium in cube as it's far rarer to get an artifact like Mishra's Bauble into the yard, however at tight cube lists fetchland density is high enough and creature, land, instant, sorcery is not particularly difficult to hit.
Too slow imo in a slot that’s too stacked.
It’s only application is aggressive and recursive durability is not the axis you want to attack on with a heavy red deck.
no interest
What's the axis on which you'd want to attack on with red aggro?
With the caveat that I haven't been able to cube for a long time outside of MTGO cubes... My constant experience with "standard" powered cubes has been that red aggro is just worse than white aggro. White has all the best toys: removal that can hit anything, one-drops that help blank removal and blockers, Wrath-proof two-drops, Bolt-proof three-drops and several flavors of 4-drops that give you longevity (PWs) or end the game if you're even just a tiny bit ahead on board ('Geddons).
Red aggro feels one-note, much more likely to fold to a Wrath, has little options in terms of grinding back from bad board positions. I'm drawn to the idea of red threats that keep coming back. Is my impression of red completely off, and/or have new cards like Laelia changed things?
Red aggro has gotten much stronger over the last couple years.
It think it's actually the strongest aggressive color, better than both white and black.
If you're running a low curve (which red wants to do), red might now sneakily be the best card advantage color over blue - blue card draw is much slower and just can't match the rate / efficiency of red, although it still has the best cantrips / card selection by far.
Plus all the Goblin Rabblemaster variants still set the standard for 3 cmc goldfish damage output.
It also obviously has the best go to the face burn as well as lots of great creatures with etb removal.
It's Birthing Pod for artifacts.
Unfortunately, artifacts don't tend to have as much etb and persist shenanigens as creatures do, so I think this will be a lot weaker than Birthing Pod, which itself is not good enough to make the cut in many or even most cubes.
As a result, I think this is too narrow and a pass.
This is a good card, but it's obviously miles below Dauthi Voidwalker.
Opponents aren't going to walk into the ability, so it's not really that powerful.
Not sure this is actually better than say, a vanilla 3/2 shadow with no ability.
This is a really solid card, but competition is stiff as noted.
I'll likely keep an eye on this rather than testing, but it could surprise to the upside.
Likely though, I think this will turn out to be solidly worse than something like Master of Death which can be more reliably recurred.
As a result, I think this probably won't make the cut.
I'm at 360 with both of those cards, and it also helps me in my quest to try to make delirium a thing, so I'm going to give it a shot.
Note that I am able to play Lurrus as a companion in the SB, which is very powerful.
The curve is extremely low and disruptive, similar to current modern Rakdos decks.
Hence, why I consider this a potentially very viable archetype.
https://cubecobra.com/cube/deck/60e78a8e82955b1044dd4dcd
I'll watch it rather than testing
An MH2 card that flew under the radar but is making big waves in constructed, Unholy Heat is an efficient removal spell in the same vein as Fatal Push. While the condition is certainly harder to hit, Unholy Heat goes much wider than Fatal Push - once you hit delirium this is almost functionally a single mana instant speed Dreadbore.
Given its medium floor as an early instant speed removal spell and its high ceiling as an instant speed answer to bombs like Primeval Titan, Consecrated Sphinx, Oko, Thief of Crowns and Teferi, Hero of Dominaria, I think this card is a solid role playing cube card consideration that contributes to a growing critical mass for a spells matter / delirium matters aggressive archetype.
This is certainly not a common cube card, but I do see it's usage in cube trending up.
Mishra's bauble has come into its own over the years and is now a modern staple.
A few years back it was doing big things with the likes of Urza, Lord High Artificer and Emry, Lurker of the Loch, two popular cube cards that it's great with.
More recently, it's been tearing up the modern metagame in Rakdos delirium decks built around Dragon's Rage Channeler and Unholy Heat, which seems to be the top deck at the moment (although the metagame is still relatively nascent). It makes great food for Kroxa, Titan of Death's Hunger and is an efficient card draw engine with Lurrus of the Dream-Den, two other modern staple cards that hold their own in cube.
But beyond that, it's also a free card selection cantrip with any fetchland or shuffle effect - this is extremely powerful in both constructed formats like Modern as well as cube, as anyone who's played Preordain can attest. Because of this, I actually think the card is most viable in 360 cubes where fetchland density is highest.
DRC is proving to be a house in modern and legacy.
With cube curves trending ever lower, DRC seems like a strong option.
It's certainly better than Delver of Secrets, and will slot perfectly into a BR spells matter aggressive deck alongside Sedgemoor Witch. Obviously pairs great with Kroxa, Titan of Death's Hunger as well.
But even in monored, can be very sweet. Admittedly, it's harder to hit delirium in cube as it's far rarer to get an artifact like Mishra's Bauble into the yard, however at tight cube lists fetchland density is high enough and creature, land, instant, sorcery is not particularly difficult to hit.
Red aggro has gotten much stronger over the last couple years.
It think it's actually the strongest aggressive color, better than both white and black.
One reason is the extreme amount of efficient card advantage packed onto aggressive threats, such as:
Ragavan, Nimble Pilferer
Bonecrusher Giant
Robber of the Rich
Light up the Stage
Laelia, the Blade Reforged
If you're running a low curve (which red wants to do), red might now sneakily be the best card advantage color over blue - blue card draw is much slower and just can't match the rate / efficiency of red, although it still has the best cantrips / card selection by far.
Plus all the Goblin Rabblemaster variants still set the standard for 3 cmc goldfish damage output.
It also obviously has the best go to the face burn as well as lots of great creatures with etb removal.
That being said, I'm not a fan of this card.
It's a decent card, but don't see it cracking most lists
Unfortunately, artifacts don't tend to have as much etb and persist shenanigens as creatures do, so I think this will be a lot weaker than Birthing Pod, which itself is not good enough to make the cut in many or even most cubes.
As a result, I think this is too narrow and a pass.
I'm not playing looter though, so I'll probably just watch this to start.
Opponents aren't going to walk into the ability, so it's not really that powerful.
Not sure this is actually better than say, a vanilla 3/2 shadow with no ability.
I'll likely keep an eye on this rather than testing, but it could surprise to the upside.
Likely though, I think this will turn out to be solidly worse than something like Master of Death which can be more reliably recurred.
As a result, I think this probably won't make the cut.