This might not seem too great on the surface, but I like it! Sure, it’s very typical RG design, and it is a 2/2 for 4 mana – but, there’s still some upside here.
I think the continued discussion about the Partner Commanders is if they can stand on their own, not many can. I think we have another instance here where Tana could be built around as a solo Commander, but gains a lot by being Partnered. One that immediatly comes to mind is Reyhan, Last of the Abzan. Adding another color in Black for removal spells and additional combat tricks to ensure Tana deals damage for the trigger. You’ll have a hard time convincing most Commander players not to play Prossh, Skyraider of Kher as their General in Jund colors. But, variety is always worth exploring.
If not Jund then we can always shift into Naya for the other Partner Commanders such as Bruse Tarl, Boorish Herder (we seem to revisit this Commander a lot!) or even Sidar Kondo of Jamuraa for extra triggers or evasion. I do think the discussion is leading to utilizing Reyhan, but there’s a bunch of options on the table for viable Partners. If there’s not a strong argument to build around Tana as either a Partner Commander, or solo (people will try regardless!) then there’s absolutely merit as a 99 card.
Perhaps the best application is a Voltron archetype and you can either be RG/Naya/Jund/whichever and utilize Tana the same way as Uril, the Miststalker. I don’t know if that’s as worthwhile, but Tana can take over the game just the same. You also should consider extra attack phase effects such as Seize the Day or World at War.
I don’t think there will be much initial desire to acquire this card, so that’s good for any players looking to pick up Tana at the right value point. I think it’s worth waiting, but I don’t think it’s current value is really such a bad deal if you can’t wait. I don’t see this card trending much early on, but it will remain to be seen if there’s any long term potential. My initial evaluation says no.