Coat of Arms is your friend. Trust me, the amount of Squirrel Tokens you'll spit out, turning them all suddenly into 11/11 creatures is well worth it. Played a game today with my Saproling deck today, it was quite slow so I managed to build them up alot. It got tence when he'd kept doubling his life. However after a brief Wrath of Godding the forces were reduced. Vederoth got played most Saps came in, build them up a little more, suddenly a swarm of 16 16/16 creatures attacked dealing 200+ dmg
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I take it you mean protect yourself, because otherwise that wouldnt work because its not targeting anything. (protection is essentially a specific "Cannot be the target of spells or abilities)
Erm, I donno, its a good sized deck, so speed shouldnt be an issue. Id say my issue lies in the number of cards of each you have. Most of them a two, Id be tempted to remove some of the less important ones and at 1 or 2 more of those that are crucial to the deck like Muscle Slivers and Winged Slivers. Check out my Deck. http://www.mtgvault.com/viewdeck.php?did=8196
My friends got a deck like this, they're pretty unpleasant. Maybe replace the Overseer with an Avatar of Woe, it fits in nicely with the theme and they're a fairly chunky critter although I suppose they're 2 mana more.
Surely its a little slow. Theres nothing under 4 mana, which means for at least 4 turns you're defenseless. I think you need to speed it up. I can see the idea of a spider deck, but try and find some cheap ones for like 2 mana. Try removing the Giant Spiders and put some Aquastrand Spiders in. they're cheap and you can always move their tokens to big up the others.