If an effect allows you to put a card with particular characteristics onto the battlefield without instructing you to play or cast it, you consider only the characteristics of a modal double-faced card's front face to see if that card qualifies
It seems a natural question to consider whether Desecration Demon could go in our Demons deck, but unfortunately it doesn't seem very likely that this is better in the foreseeable future than Archfiend of the Dross, and there's a limit to how many creatures like this (somewhat expensive and vulnerable to the same play patterns) that you can play at once so it's also unlikely we'd play both at once
You don't need a second mortgage to experience a Black Lotus in your Commander night
You pay 1 life to exile the top card of your library, then it goes to your hand at end step
Firstly, it lets you cast birds or lands off the top of your library
By reprinting 171 cards, players can hold onto some of their favorite cards from those sets for competitions