Counterspells for control: Spell Burst has buyback, Stubborn Denial for a 1 CMC counterspell (mostly to prevent creature wipes), and Not of This World for a free protection for your Eldrazi.
Lightning Greaves to protect your Eldrazi and give them haste to start annihilating right away. Staff of Nin for card draw and to plink pesty 1/1 creatures. Proteus Staff can morph your small guys into Eldrazi (or produce another Trinket Mage to get you an additional map), but could also be used to morph your enemies big boys. Mindslaver is just fun for the hell of it when you have tons of mana lying around.
The Maps and Map fetchers help get your posts going fast. The blue counterspells I chose fit well with this deck. The artifacts make for fun, and nothing is better than watching your opponents permanents disappear.
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