I think cubable for Fire Prophecy is correct in my opinion. Its still instant, still 3 damage, and the ability to "rummage" is a really nice being able to ditch unuseful cards or extra lands. I would say 80% of the time im using burn spells on creatures anyways. If it were sorcery speed i would have other opinions.
Borderline Cave of Temptation – A land that can tap for colorless right away, and can be cashed in later for another effect is on par with borderline lands (like Cradle of the Accursed) and filters (like Shimmering Grotto). This has both effects, but it’s just not enough to make it cubeable.
I think we might have rated them in the forums, but I didn't see them in the drop downs. Check my list above, that had all the sets that are past Rivals of Ixalan, which is what Al said was the last set he updated from.
Any case, here's the multi-colored. Please review everyone!!
Borderline Azorius Knight-Arbiter - Good combo of keywords that allows for a clock, but very slow and costly Senate Griffin – 3 powered flier that scrys is decent, but that can be found mono-colored. And because of the 2 toughness it’s better in aggressive decks, which may not want this for their top end.
Cubeable Dimir Guildmage - is a bit fragile but has huge potential to draw cards or to shred opponents hands apart. Good at basically any stage of the game.
Borderline Footlight Fiend – Devils are interesting, in that they are better than they look on the surface. But it’s easy to ignore a 1/1 attacker also.
Cubeable Frenzied Arynx – Already a 4/4 trample for 4CMC, or a 3/3 trample, haste as a baseline. But then being able to pump it for extra trample damage makes this a powerful card with a lot of versatility.
Borderline Grasping Thrull – A 3/3 flier for 5 is a little over costed, but the drain is solid. It’s a slightly bigger Blind hunter, but that’s not necessarily a good shift. Imperious Oligarch – An interesting card that can be good for aggressive or controlling decks. But a little body leaving behind a 1/1 spirit isn’t anything new.
Cubeable Canker Abomination – A high variance card, but on average still a good body. And with a lot of removal (or an opponent misstep) this could of great rate.
Borderline Rhizome Lurcher – In a graveyard/sacrifice themed cube it has to the potential to be large. But you may not want to cast on curve. It takes a lot of work and doesn’t have trample. Pitiless Gorgon – Flexible creature with good blocking potential. But it’s filler.
Cubeable Aeromunculus – A solid flier for 3CMC, with a threat of activation ability can be very powerful.
Borderline Applied Biomancy – It’s possible for this to win a combat and bounce one of their creatures. But it will be hard to set up both at the right time. If it was +2/+2, it’d be much easier to include. Growth Spiral – An instant speed Explore. Not enough to pull it into cubeable.
Cubeable Fire/Ice – Two decent effects on one card. The flexibility of this instant is really good. Hypothesizzle – Card filtering and damage spell in one. Better than Cunning strike it can take out larger creatures and be cast on an empty board in a pinch.
Going from 2 mana on T2 to 4 mana on T3 is often more impactfull than going from 3 mana T3 to 5 mana on T4. That's also why everyone is running Arbor Elf and Llanowar Elves, but barely anyone is running any mana elves that cost 2 or 3 mana.
So while it's not my favorite, I can compare it to Wretched Gryff. A flying body that gets a good upside when casting it by saccing a creature. and as Hydra said, it can be a surprise hasty attacker in the right deck. Not as much upside of drawing a card, but I can see it turning some games around.
Also I feel like Fountain of Ichor is Borderline. Guardian Idol is cubeable, and this while costs one more, is also a better threat and better blocker. I've seen a number of cubes run a 3CMC mana rock, this one at least is rainbow. A good control deck could make use I think.
Ok. I'm taking the night off from cataloging (because of Night Hydra's help - thanks). I'll work on Multicolored tomorrow/friday, and the short land update.
Borderline Stronghold Confessor The two modes makes it interesting. But still not a powerful card. vampire neonate - an interesting option for support. It’s really good in the grindy matchups, but it lacks the one power or toughness to be an instant include.
Cubeable Gluttonous Slug - Early curve, evasive, and can potentially hit 3+ power. This is dangerous in arguably all but the slower decks.
Borderline Caligo Skin-Witch - its nice if you need some defensive creatures, but the discard comes really late and the body stays weak Plague Wight a 2/1 that can’t be blocked by X/1s. But only works on attacking. Lazotep Reaver - two bodies for 2 mana is decent for sacrifice cubes. But neither is very exciting.
Cubeable Headless Specter - Pauper Hypnotic Specter. The ability is limited to being an aggressive candidate. But B/x aggro just got even more toys recently. Support for that, means this is an auto-include. Otherwise it is just a harder to cast Wind Drake Audacious Thief – Not far off from Phyrexian Rager, but if you can attack with it more than once it becomes very good.
Borderline Deathbloom Thallid – Not horrible stats for 3CMC and it does provide another chumper 1/1 on death. Sickle Dancer – With a warrior theme, this is passible, else it’s under classed. Hired Blade – With flash, it can become a sort of removal. But it trades with most creatures, and 3CMC is still outclassed with other removal Spark Reaper - the first repeatable card draw sac engine at Pauper, which is significant. But the cost to cast and activate the ability are just a bit too high for really competitive play, but it could be close. Gorging Vulture – Really good for graveyard based cubes. Else it’s basically a Wind Drake Savage Gorger – It has the potential to get really big, with it supporting the initial hit with flying. But it still takes a lot of set up to be great.
Borderline Slum Reaper – Effect is good and can get around hexproof. But only if they have no other creatures, and that can require set up. Plus you still need to lose a body. Even after this will trade most any 2 drop. Undercity Scavenger a reasonable card for sacrifice based cubes, but it’s still 2-for-1ing yourself. Azra Smokeshaper - Unlike other ninjas, this is a once and done ability. Great combat ability, but this has a few hoops to make it a 2-for-1, and even then it is just a 3/3 afterwards. Rank Officer - Good for aggro decks what need a late game outlet/finisher for their smaller bodies. The EtB is deceptive. But getting 5 power on the board for 3b is decent. Shame this things rear is so fragile it cannot block successfully.
Cubeable Blade Juggler – a 3/2 draw a card for five is just barely acceptable. But get it for the spectacle cost of 3CMC and it’s a fine card. Ninja of the New Moon - While it is a vanilla Lava Axe ninja, it is a Lava Axe Ninja with only a single black in the Ninjitsu. Whether a curve-topper, or another step in a midrange stompy plan, this will hit hard once, reuse a smaller body, and then likely kill a blocker next turn. Ignoring a 6/3 is not a winning strategy. And the "haste" option really gives this a nice punch above what we'd expect for 3B mid-combat. Silumgar Scavenger - Likely going to be the largest black flying body to exist. Eating an outclassed body to get haste and soar over is much less expected in non-Red decks. This fits in non-Sacrifice decks too as it rewards alpha strike attacks by giving a threat that must be dealt with. Only the fastest, or most creature-lite, black decks do not want this.
Borderline Epicure of Blood – If your cube supports enough lifegain, this can be powerful. Else it’s just a 4/4 for 5CMC.
Staple First-Sphere Gargantua - This is the true Pauper Phyrexian Gargantua. Having built-in value via Unearth means this fits decks that may have a self-discard theme, or just needing an extra push on a given post-death turn.
Cubeable Defile - 1cc Removal that gets better the longer the game goes on. Unless you play heavy nonbasics, this will be better than Disfigure.
Borderline Divest - Barely an upgrade to ostracize, except your running tons of artifacts. Fungal Infection – With so many X/1s, it is possible to make this a kill spell, or combat trick that leaves you with a 1/1. But hard to set up. Kaya's Ghostform is a very cheap way to protect your creatures. It even prevents exile, which is unique in Pauper. But it’s very reactive, and suffers the 2-for-1 potential against you while it’s on the stack.
Borderline Ob Nixilis's Cruelty - A straight up instant speed answer for most creatures in cubes, that also exiles. But at 3 mana, it’s outclassed by many 0-2 CMC removal spells. Unholy Indenture – Having the creature return to the battlefield (stronger) is powerful. But it’s an aura with can cause 2-for-1s, and doesn’t work well against the white/blue on board removal
Cubeable Moan of the Unhallowed – 4/4 stats on 4cmc is good, and this comes divided (synergy with sacrifice and pumps) and with flashback for late game.