Wooden Dark Tiamat

Once Wooden Dark Tiamat obtains his Devil subtype, he'll be the only farmable devil with multiple dark row enhances that works as a sub - Satan's purely a lead. This will make him valuable to the dark devil teams - Ronia and Lu Bu most notably, but also the odd Vampire Lord 2/4/2 or D/W Batman teams.

On the downside, Tiamat has the worst base stat total of any late bloomer dragon, and even with the buffs coming that's not going to change - his (future) stats of 2510 HP, 1554 ATK, and 258 RCV aren't bad, but they're not great. His active skill is a useful little mini-burst, but the base cooldown is just excessively long: fortunately, while skilling up Hadar, you'll get some Fog Chimeras to start bringing it down low enough to be practical. Leveling up off Hellheim drops (60% drop rate on weekends, 17k fodder xp a pop, 440 xp/stam for rank xp) is another possibility if you're farming for Liliths anyway.

He's good, and will essentially become Mini-Loki, but unlike Hadar vs. DA Lucifer (where Hadar has monstrous HP) there's nothing that Tiamat can offer that Loki can't. A solid choice for a non-IAP player, but not something to seek out if you've got REM choices to pick from.

My Ronia thanks GungHo for the new devil subtype.

I feel like he could be a decent Cauchemar/Astaroth sub. Devil type, dark/wood, row enhances for the duo's skill combo...