There aren't many downsides to playing as many colors as possible, so this card can go a long way towards leveling the playing field
There are more powerful ramp lands, much more powerful ramp effects, more powerful late game value lands and again, much more powerful value effects on offer
I dont know how anyone is even attempting to sleep in Duskmourn
Also, it's quick (haste)
Your turn does not end if the Pokemon this card is attached to becomes M Charizard-EX
With so many cheap spells in their deck, it was possible for Jund to be at parity or even ahead in the early turns of the game, which made Burning Earth a very weak play, especially when they could just make up the life loss with Huntmaster of the Fells and Thragtusk and absolutely bury you if you took a turn off to play it." Brian Kibler, in regards to his G/R Aggro deck in last weeks article While this is taken a little out of context, as he is specifically talking about Lifebane Jund, I think most of the points hold true