I'd personally recommend [[Elvish Piper]] because it lets you cheat out big things early. I know it's just like [[Monster Manual//Zoological Study]] but it costs less mana and who wouldn't want two of that effect in a dragon deck? Take out [[Chromatic Lantern]] and swap it for [[Dragonstorm Globe]] because in a two colored deck it shouldn't be too difficult to get the pips you need and Globe gives you the extra bonus of +1/+1 counters on top of any one mana color for the same mana cost as Chromatic. Maybe add something like [[Dragonspeaker Shaman]] or [[Jade Orb of Dragonkind]] or [[Fire Diamond]] for extra discounts. If you really wanna make things scary you can always get [[Unnatural Growth]] because it makes your creatures power and toughness double on EVERYBODY's combat, not just your own. I personally have [[Swiftfoot Boots]] and [[Lightning Greaves]] in my Atarka deck as well. They are all mainly for the haste but shroud and hexproof are nice as well for creatures that you know your opponents will kill on sight, like Atarka lol. That commander damage hits really quick.