Wow, you guys are being tough on this card. I play coin-flip cards, and personally I feel like this is one of the best - and most powerful - flippers that they have ever created.
Its stands alone in MP as a wrecking ball, and really it is not difficult to build around.
And then you team it up with Krark's Thumb and you have a seriously oppressive weapon. The opponent has to sack all of their creatures if they want to get in your way, and in turn you leave a 1/1 flyer back to block and what are they supposed to do? You own that table.
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And by the way, Mana Flare is now Green.