Take Damage to Gain Advantage: Since a Control deck has limited ability to race with you if you get low on life, you have increased license to trade damage to yourself for advantage
Already, this is pretty good
Amulet can produce some lightning fast kills, but also has access to Bojuka Bog, which they can also pick up with bounce lands to effectively lock Dredge out of the game
It's a win-win situation no matter what, making sure you are getting incremental value turn after turn
Rad from Nuka-Nuke Launcher causes loss of life and goes away when nonland cards are milled
In case you didn't know, amassing Orcs is backwards compatible with cards from WAR that amass Zombie tokens, like Gleaming OverseerGleaming Overseer and Lazotep ChancellorLazotep Chancellor