If the enchanted creature gains an ability after Duskmourn's Domination becomes attached to it, it will keep that ability
This seems like an obvious solution
While that would have been cute for a regular EX, its extremely risky for a Mega Evolution, losing which instantly ends the game with you on the losing side
In a deck with a lot of flashback or jump-start, you should be able to make a good number of birds, even if their limited ability to block does really present a weighty downside
Youre golden if you can stop every one of your opponents threats and preserve the size of your own library with Elixir of Immortality, Darksteel Colossus, or a Mystic Sanctuary loop
Through this process, Wildcards on MTG Arena effectively operate as a form of secondary market for the game