I have a really fun blue-black kleptomania deck with Wrexial as the current commander, but it looks like Lazav will take over as head honcho. For extra style points, kill someone with Lazav copying their commander.
And now there's Consuming Aberration! Am I an evil person for wanting to give it a trepanation blade or three? Get an infinite number of trepanation blades with Prototype Portal or something, and see if you can mill them in one hit!
Sta.sh
