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any good ideas plz comment
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Its tribal in the sense that all you creatures are the same type. You need something that will let your creatures benefit from one another i.e, act like a tribe. Coat of arms is good, also consider the following: Urza's incubator, Descendant's path + (paradox haze and Call to the Kindred which are blue unfortunately) Spiders also benefit from doran, the siege tower but you will have to add two more colors. That shouldnt be a huge problem to manage if you what do down that route.
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What about Spider Spawning? It DOES require black for its flashback, but you can pull that off.
Jungle Weaver is just to mana heavy, and cicling it wont help much. I would run Adaptive Automaton and Door of Destinies for empower the spiders, a few Cavern of Souls that is a must for tribal. Please comment my deck if have time, http://www.mtgvault.com/ViewDeck.aspx?DeckID=347794
Fun little tribal here. Door and Urza's incubator really help this deck out. However, I don't think that coat of arms is as good to help with this, since it aids your opponent quite often too, if I'm not mistaken. I would look for some better card draw and/or mana ramp here instead of the Coats. Rampant Growth would be a decent addition for faster spiders, and maybe find something for "draw cards equal to target creature's toughness". I know there was one in ROE for that.