The basic argument of this thread as I understand it is that the interaction between Vincent and veiled units makes Vincent overpowered. Some relatively simple analysis clearly shows this argument is invalid.
I have simply looked at the net effect if Vincent is played immediately after each of the 22 veiled units. In one case, the player of Vincent clearly trades up, in 11 cases the player of Vincent clearly trades down, and the remaining 10 are relatively equal. This is absolutely not the marking of an overpowered card.
My calculations are based upon certain assumptions: that evolving leaders are played round 2 or later, that a point of provision is worth between 1 and 1.5 strength on the board, that tempo is disregarded, and that veiled cards with orders will have no opportunity to use them (e.g. no zeal).
Vincent, costs 11 provisions, and will, after use, leave 5 strength on the board.
When played vs. Auberon, the opponent for 11 provisions, will have created and played a random copper wild hunt unit. There are 3 such cards at 4 provisions and 5 such cards at 5 provisions. In almost every case, the wild hunt unit will play for more value than Vincent’s 5 point body, while net provisions are equal — a trade down for Vincent.
Harold costs 11 provisions and plays a bronze warrior from the graveyard. The drawn warrior will almost certainly be worth more than a 5 point body — a trade down for Vincent.
Jacques costs 11 provisions and summons 6 strength in tokens, one mor point than Vincent — another trade down for Vincent.
Viraxas costs 11 and can be destroyed before getting an order off. This is the one clear trade up for Vincent.
Usurper generates 6 points in tokens (which likely trigger other boosts), while costing 11 provisions — a clear trade down for Vincent.
Eithne, for 11 provisions, will generate two tokens for a total of 4 points, though it is likely these tokens will be able to generate additional points. I will call this one approximately even.
Magic Mirror plays for 11 provisions and will transform one card into a random gold card before being destroyed. There is too much randomness to easily attach a value here. On average this feels slightly advantageous to Vincent, but is close enough I would call iteven.
Herkja, Egmund, and Dunca all cost 7 provisions and will generate one additional value before being destroyed. Thus Vincent gains 4 points of value for 4 provisions, probably a bad value, but close enough I will call it even.
Phantom, Roderick, and Urcheon also cost 7 but will be destroyed without effect on other units. Thus the player of Vincent gains 5 strength on the board for 4 extra provisions spent. I would consider this even.
Marlene and Fallen Knight cost 6 provisions and will be destroyed without further benefit. For 5 extra provisions, Vincent generates 5 value — not good, but close enough I would call it even.
Scout and City Guard cost 5 provision and would be destroyed. Spending 6 extra provisions for a 5 point body feels like a trade down to me.
Torturer costs 5 provisions and gives a unit spying — a definite trade down for Vincent.
Duen Cabral is even worse for Vincent, costing only 5 and inflicting 2 points damage, giving Vincent a net 3 points for 6 provisions — a substantial trade down for Vincent.
Aen Elle, Invader, and Fortune Teller only cost 4 provisions and clearly represent trades down for Vincent.
In conclusion, Vincent might be aggravating; he’s not overpowered.