They change back into Ulrich if two or more spells were cast in the last turn
Lathril was a fun deck, and especially fun in the way I built it: an aristocrats build, built around her drain 10 life ability
I'd still say sell Ledger Shredder - especially now that it's $25 - but I also thought that was the best move when it was $10 or $15, so who knows at this point
Trigger Discard (sample: Bottomless Pit) I play a permanent that causes one of the above discard effects to trigger whenever situation X happens
However, because it requires such a specific setup, its often not worth the effort to build an entire deck around Goofys ability
Personal opinion: Looting isnt worth spending extra mana on in Commander, so the Gateways not really getting there on its own, and the threat of this flipping is enough to attract the attention of your opponents