More ramp necessary.
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I usually use the Skinshifters for the 4/4 rhino with trample, or the 0/8 plant in case of emergencies. The Skinshifters blocking as a 2/2 with flying is a little silly, because the majority of the fliers you're going to be wanting to block to save your life probably aren't going to be 1/1s, or even 2/2s. Especially with squadron hawks dropping out of block. I do thank you for your suggestion, however. :]
I am a little worried about taking away land from this deck. Garruk and the Primordial Hydras, which are all fairly heavily land based cards need as much land on the field as possible to be effective. I don't think it would be an efficient choice to take land out and decrease the odds of getting it... But I may be wrong? Beast Within is hardly a game breaker, at least. However, I do like that card quite a bit, I will replace it for Vorinclex in my sideboard. Thanks for that. :] (Anti-artifact)