Magic the Gathering Deck Building

[TimeLord]

Since getting into Magic the Gathering properly I've been building a deck based on my favourite deck from the Magic 2012 game, Ancient Depths. The idea of the deck is to get both as much Land and Saproling tokens onto the field as possible in order to activate one of my two Mass Polymorph cards and replace all the tokens with creature cards that would otherwise take an age to summon one by one. However while acquiring all the cards possible (and some extras to tweak the deck) I've been buying probably more than I need of each card and I've realised that I just want to throw everything into a deck but I know this will end badly as it comes close to 100 cards including all basic lands.

This is where I need help. Below is a list of every card I have available and the number of them I own. I'd like some advice on how many of each I should put into my deck.

20  Forest
20  Island

4 [mtg_card=Aether Mutation]
4 [mtg_card=Parallel Lives]
2 [mtg_card=Compulsive Research]
4 [mtg_card=Cultivate]
4 [mtg_card=Explore]
2 [mtg_card=Explosive Vegetation]
2 [mtg_card=Polymorph]
2 [mtg_card=Mass Polymorph]
1 [mtg_card=Tidings]
4 [mtg_card=Yavimaya's Embrace]
2 [mtg_card=Treasure Hunt]
2 [mtg_card=Levitation]
2 [mtg_card=Rite Of Replication]
4 [mtg_card=Mind Control]
2 [mtg_card=Skyshroud Claim]

1 [mtg_card=Ulamog, the Infinite Gyre]
1 [mtg_card=Emrakul, the Aeons Torn]
1 [mtg_card=Elvish Piper]
2 [mtg_card=Giant Octopus]
1 [mtg_card=Lorthos, the Tidemaker]
4 [mtg_card=Coiling Oracle]
2 [mtg_card=Tidal Kraken]
2 [mtg_card=Simic Sky Swallower]
1 [mtg_card=Isleback Spawn]
2 [mtg_card=Kraken Hatchling]
2 [mtg_card=Ondu Giant]

Any advice would be greatly appreciated. Bearing in mind that I'm still quite the novice to this game. I know how to play and all that but the Hexproof articles still go way over my head.

 

[SPARTANXIII]

I don't really do a lot of Deck building to be honest, given my limited funds for the whole thing, plus its not in my general area and I don't really want to go out of my way. I just have a desk that's all White and just play from there. So far "Bleach Rainbow" hasn't won, but I don't really pay to win to be honest; just playing in through in my head and seeing how it goes is good enough for me.