Sanguithor looks terrible on paper, but once you actually own it and start testing it in PvP, it feels like a completely different monster.
The biggest reason is Heart of the Team. Unrestricted untargetable with no condition is an insanely powerful passive. From the start of the match, the opponent has fewer valid targets, and that alone can be used as a strategy. You can force them into hitting revenge monsters, awkward targets, or units they do not want to touch yet. It creates passive pressure before Sanguithor even gets a turn.
When it does get a turn, the kit is surprisingly flexible. You can slash all enemies, instantly kill one target, seal one enemy for 300 seconds, or reduce one monster to 1 HP. All of those effects are powerful, even if the TU is very high. It is not a fast monster, but each turn can completely change the state of the match.
The element and type are also much better than they first look. Being Fire and Dragon gives it strong synergy with Emberelle, helping her maintain Death Immunity more consistently. It can also work with monsters like Stellaurum, keeping the shield protected for a very long time, and Azida can benefit from similar positioning.
The one part I still do not fully understand is the revenge passive. Asystole hitting your own allies feels awkward and unnecessarily punishing. Maybe there is a deeper combo reason for it, but right now it feels like the one part of the kit that works against the monster rather than supporting it.
Its very low speed is not necessarily a bad thing either. At 25 percent speed, Sanguithor becomes a great candidate for setups with Mortilys or Giehretus, where slower monsters can be manipulated into much stronger positions.
After playing a good amount of PvP with it, I actually do not think it needs lower TU or direct skill buffs. The high TU makes sense because the effects are very strong when they land. What I would change is the Secret Skill, because Haemorrhage does not feel worth turning on most of the time. I would also reconsider the revenge passive and replace it with something that supports the kit better. Personally, I would love to see Camouflage there.
Stat wise, it has great HP and very high attack, while the defense is average and the speed is intentionally low. That stat spread fits the concept well. It is built to sit on the field, restrict targeting, and punish the opponent when it finally moves.
Design wise, this is top tier. Probably top three among non waifu mythics for me. The red dragon look is amazing and the whole heart themed concept is one of the coolest monster designs they have released.
Overall, Sanguithor is not a plug and play meta monster, but it is much stronger than it looks at first glance. Untargetable with no condition is too powerful to ignore, and in the right setup it can become a very annoying match control piece.
Current Placement: Collection Fillers until they change the Secret Skill and remove or rework that unnecessary revenge passive.