Since there are limitations, I believe it is not possible to make a "moba" within the BF.
However, I imagine it is possible to implement "functions" to create a "similar" game mode.
Correct me if I'm wrong. But in the introduction, we can only use certain cards after a certain "event".
Perhaps, if you implement this kind of "limitation" on a custom map, it might be possible to create something like a moba.
And as if there are only 2 resource types in the BF (orbs, and the other one there that you spend to summon each unit, which I've forgotten the name now and I'm feeling silly about it).
I will put by points to try to argue more "explained" what I imagined.
a) The player would be free to set up his deck.
b) However, you could only start each game with tier 1 cards.
c) The neutral monster fields scattered around the map would release the use of tier 2 cards, as well as the monuments for "orbs" would be in the jungle.
d) Once a neutral field is defeated. The player would have access to a certain type of card (tier 2 cards), but could only evoke such units with the second monument, which in order to achieve this, would eliminate a monument site that would be guarded by units.
e) Another type of "reward" that I believe might be possible would be, after eliminating certain neutral fields, the player gains some unit (once all monsters in the neutral field die, the player gains control of the finished unit). ) This could be prepared just as there are in some missions, would leave such a unit in the neutral field "standing or locked in a cage" and after all enemy units are killed, you would approach and gain control of such a unit.
But it should be a higher unit than you would control, for example if you eliminate a windweaver squad you would get a unit of 2 orbs.
I hope you have clearly explored my idea (I thought well after reading the topic to try to argue briefly). I tried to search the memory for things that already existed so as not to add complex mechanics to the game. But only, to "slightly" modify some existing xD.