One thing I noticed is that you've stated "Now, a sideboard can contain a maximum of 15 cards." While this is true, it's also a tad misleading. You CAN have 15 cards in your sideboard, but if you don't, you MUST have 0. It's either a full sideboard or an empty one. The rules don't allow for anything in between.
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Go me!
It helps filter the lands out of the deck somewhat, so that you're less likely to draw lands mid to late game.
Sideboards must be either 0 or 15 cards. Also too many cards only appear once in your deck. Try to avoid this as it lowers the chance of you drawing it when you need it.
Swap Holy Day for Safe Passage. It might cost 2 more mana but it is far superior. It prevents ALL damage dealt this turn that affects YOU and/or creatures YOU control. Think about it.
Nice deck. I like the fact that it's type 2 (standard) legal; there just aren't enough of these around. I suggest swapping Glorious Charge for Honor of the Pure. It has exactly the same cost and effectively the same effect but its and enchantment so it sticks around. Other than that, as Puffermad said Harm's Way would be nice. All in all nice work.
I know full well how bloom tender works. I simply misread your strategy outlined above and in my misinterpretation believed you were using bloom tender to get mana from lands. Next time drop the arrogance and make a simple correction
Sorry to tell you this but lands are colourless. This means that if you have bloom tender and a land of each type, bloom tenders ability will still only give you a green manaand nothing more. Lands produce coloured mana but are themselves colourless unless stated otherwise
First of all you really should reduce your deck to 60 cards. Secondly you really don't need 4 spellbreakers unless your facing a counter heavy blue deck. Consider putting in some spearbreaker behemoths, and some cheap creatures to get out your big creatures out faster (birds of paradise, llanowar elves, elvish piper etc). Mosstodon would also be useful because it's a crying shame to have that many big monsters and no trample. Have a look at mine and see what you think http://www.mtgvault.com/ViewDeck.aspx?DeckID=24449
It will mill the deck because the cards are not returned to the library until a card with a lower cost is played. Because there is no such card in this deck cards are exiled until none are left. You still need to exile from your library but you can't because there are no more cards. That means you lose!
You do know that you don't have a single card in this deck with a mana cost of 2 or less? I mention this because Demonic Dread has a mana cost of 3 and has cascade. This means as soon as you play it you'll end up milling your whole deck!!
What about using levitate to give all your creature flying?
Have you thought about using armageddon? With a timber protecter out all your treefolk and forests would be saved and chances are that you opponent would loose everything.
This deck is almost a match to the pre-made deck by the same name. Desert has been replaced by reliquary tower and an island has been added.
While you do have a loop it's anything but infinite. You're going to run out of mana. Sure you can just cast it again next turn, but the idea of an infinite loop is that you can keep performing those actions indefinitely. For your loops to be infinite you'll first need a source of infinite mana. I don't think this deck will work. It's too slow to deal damage and if you're opponent cancels your horned kavus what then?