Good ideas. I'm definitely going to have some number of dragons/tasigurs in the board.
Wondering how good....
-Alhammaret would be against ramp, naming Ulamog or, if I've obliterated, naming Ugin. If I name Ulamog, the only way for them to get rid of him is to cast and resolve an Ugin who has to -7, killing himself. If I've obliterated, I can just name Ugin and stop them from doing anything.
-Blight Herder would be in the mirror. The process is pretty much guaranteed with all the digs and utter ends flying about, and since it's an on cast trigger, they won't be able to stop the 3 1/1s. Not a huge clock, but given that they'll have sided out their sweepers, it won't be easy to deal with them efficiently. Still requires a pretty big tapout, though. Monastery Mentor may just be plain better, despite being vulnerable to countermagic and ultimate price.
-Silumgar the drifting death may just be a good all purpose answer that gets through my opponents removal, kills tokens, and blocks quite well. Maybe innovation isn't the right idea.