It's surprising how well it comes out. Many of the cards in there are just to fetch lands, and with the power these creatures have I rarely need more than one or two to finish off an opponent. Plus if you take a close look they all have 3 to 8 green mana symbols in their casting, that makes Phosphorescent Feast insane, just one Khalni Hydra gives you 16 life so imagine with a full hand :P Thanks for the input :)
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I have 21 lands on 63 card plus 4 artifact that give mana, it's quite sufficient. I never have problems with the amount of mana with this deck, the trick is having the right colours ;) And as Fryza said, you can have as many Planeswalker in play as you want at the same time. Believe me, the game gets interesting when you have 4-5-6 walkers all doing their skills in interesting combination :P
Keep in mind this is a FUN deck. A ''Jack-in-the-box'' kind of deck. There is one of each card except for the monoliths who help with the colours. Some times it bombs, other times it kicks ass and sometimes it's just plain weird. But it's always surprising.