I used to run plastique's deck and found it extremely effective. There were only a few instances where winning was almost impossible and slow, mainly if an otyugh got on the field. The game is already over if your creatures are low HP. You have no way of getting rid of it and can't play any creatures since they'll be devoured.
I switched over to a graboid/shrieker rush deck and have to say it's not as fun to play and maybe a tad slower. The main reason, however, that I now use it as my main lvl3 grinding deck is that it uses the same mark as my rainbow deck (time), so I don't have to pay and switch my mark everytime I feel like I want a change.
