With the snow covered mountains - Extraplanar Lens. Which would even make Rimescale Dragon more effective.

That's a great suggestion -- Thanks! I actually removed Extraplanar Lens because it kept getting removed and leaving me one land down for my troubles.

Since you're playing snow-covered mountains, Glacial Crevasses is a great little tool both for playing politics and for directing aggression elsewhere.

Thanks for the suggestion - I have Glacial Crevasses in my binder waiting to take it for a spin; I'm just afraid of the nonbo with Leyline of Punishment and also losing lands with a commander that is so expensive. I do run it at time with great success in my Jaya Ballard, Task Mage deck!