It is the ongoing nature of the life gain combined with its cheapness that make it so dangerous for aggressive decks
We do not print official card backsour backs are designed to be clearly non-official
It replaces all your zombies combat damage with milling, and whenever creature cards get milled, youre rewarded with more zombies
Any creature the player controls that couldnt be targeted by the original spell (due to shroud, protection abilities, targeting restrictions, or any other reason) is just ignored by Mirrorwing Dragons ability
There are some hoops involved in melding this in the first place, but thankfully Urza, Lord Protector and The Mightstone and Weakstone are both fine cards on their own
Is there a guide on how to use the app