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Seems like it must've been relevant when it was in Standard...if it were legal in standard now, I'd sure it'd be played in any red decks with more than one or two critters...
Posted By:
izzet_guild_mage
(2/25/2010 8:02:22 AM)
Aaron’s Random Card Comment of the Day #38, 11/17/11
Mercadia’s Downfall? Seriously? Is this some kind of joke? Trust me, the downfalls of Mercadia cannot be summarized on a single card, but I guess we are to assume it was because it controlled too many nonbasic lands. Take that, Tower of the Magistrate and Fountain of Cho!
Cards with names like these are typically reserved for apocalyptic third sets, but the Masques block was unique in that each set took place on a different plane (Mercadia, Rath, and Dominaria), so Mercadian Masques was the first and last time Mercadia was a setting for a Magic expansion.
Heavy-handed nonbasic land hosers are typically meant for constructed play, as they are either too mean or too weak in casual play, but this one didn’t work out in that regard. The card cost 
for a while during development, which I guess could have been too good--a sort of scaling one-sided ... (see all)
Posted By:
Aaron_Forsythe
(11/17/2010 9:40:55 PM)
This is actually rather nice, as there only needs 2 nonbasics under an opponent's control for it to be as efficient as trumpet blast. Most serious decks have a great number of nonbasic lands, and a goblin deck could benifit greatly from using this card. However, in casual or limited play it is useless, and it's not legal in extended, so no one cares.
Posted By:
Piechart
(7/23/2009 8:49:21 AM)
I could see this being strong in the 250 format - it will likely be counting most every land your opponent plays.
The name, art and flavour text of the card are fantastically cool, too.
Posted By:
Kirbster
(12/1/2010 8:13:26 PM)
although the idea itself is a nice one and it might be quite devasting in some rare cases, this card is actually quite weak for such a specific requirement.
Posted By:
Mode
(2/6/2009 12:53:59 PM)
Something like this begs to have cycling, but as is, its not a bad sideboard option for a fast red creature deck.
Now, if it was on Magic the Gathering online, I would play it in every deck.
Update: It's been on magic online for a while now. I've played it in zero decks.
Posted By:
Kryptnyt
(6/15/2013 10:39:57 AM)
Wow. A card in the first set of Mercadian Masques block is named Mercadia's Downfall. I wouldn't want to see Ravnica's Downfall in Return to Ravnica or Theros's Downfall in Theros, you see.
Posted By:
sweetgab
(8/27/2013 12:18:55 AM)