@aelien actually his -1 supports his +1, which in turn supports his ultimate. It's... clunky. The only way Dovin sees play is if we actually get a UW heavy Lavinia Humans that can't support Dack. Even then, I'd say Recruiter of the Guard is probably a better card for the slot.
Eh, Planeswalker cards have such a high base powerlevel that you can stick a miser's 1-2 copies in any reasonable shell and they won't be terrible.
That doesn't mean you couldn't strictly improve your deck by replacing Dovin with a different 'walker like Dack.
If people actually want to discuss the card and the deck I ran, here it is:
I think people are trying to play it in the wrong shell - you don't get any more loyalty for spending mana on your creatures so tokens are a natural fit and Young Pyromancer is the best non-restricted token generator in the format.
I also think people are underestimated Dovin's token making ability. While not a key role for the card, it can function as a blue Bitterblossom. Make two tokens, attack for 3 loyalty, make 3 tokens, attack for 6 loyalty... The damage adds up to a reasonable clock: 1+2+2+3+4+5+6 = 6-7 turns depending on incidental damage. Or you can plus and ultimate 2 turns after making 2 tokens. The nice thing about the token making approach is it plays around pyroblast...they still have to deal with the fliers in the air.
And the ultimate is quick on an empty board. You only need a single Snapcaster to ultimate in two turns. Play and go to 5 counters, then go to 7 counters, then ultimate.
I think the card has applications in Legacy as well, but hey, I'm a madman that throws random planeswalkers into decks, yet somehow still wins, so what do I know...
Played more games with Dovin. I went 3-2 with him in a Legacy Stoneblade deck and he was actually quite good. Being able to throw a sword on a random thopter is solid and he makes your creatures more threatening if the opponent Thoughtseizes or destroys your equipment. I think Dovin will end up being more of player in Legacy. The token making ability is more consequential in that format.
I went 2-3 with him in Vintage with the first two matches me kind of getting nut drawn (Brian Kelly turn 1'd and turn 2'd me with Academy Rector. It could not have been more brutal). Turn 1 Dovin won a game against White Eldrazi where the Thopters punished the opponents painland manabase and the lifegain took me out of double Reality Smasher range. Game 3 I took a screenshot to show that you can play Dovin and Dack (and why a diverse set of planeswalkers will generally be better than in other formats). The final match, Dovin was literally my only out to a turn 1 Moat with double counterspell backup. Unfortunately I drew nothing but lands for the majority of the game.