I don't like the Myr cards in this deck.  I feel that with only 8 real creatures, 4 ways to make creature tokens, and 3 ways to make land-creatures, you are not statistically favored to have enough creatures to stay alive long enough to pull off the combos, especially because your 3 x Nature's Revolt are so hard to cast at 5-mana, and even when you do cast it, it doesn't give you a creature count advantage, as the other player gets them too.  If it triggers the PLanar Collapse, then poof go all the lands, yay, but now going to be difficult to cast anything yourself, especially the Biorhythm.  So really, you have 12 practical ways of getting creatures in play, only 8 of them are indestructible and the other 4 aren't even likely to come into play until the turn after you cast the Myr Matrix.

I would replace Darksteel Myr with Ranger en-Vec and My Matrix with Fleecemane Lion.  This would give you a solid 12 cheap-to-cast creatures that have ways to protect themselves from board wipe.

To take it a step further, I think I'd drop the Eladamri's VIneyard and replace it with 4 x Strangleroot Geist to bring the creature count up to 16 (~1 in 4 cards in a 60 card deck) and remove another spell that benefits your opponents probably more than yourself.