Zoraline and Three Steps Ahead are key new cards worth considering, offering unique abilities for different deck archetypes
Yawgmoth's Will is perhaps the best reason for playing this
While not available as a commander option, you can also speed up the ThreatenThreatens by combining this with Sigurd, Jarl of RavensthorpeSigurd, Jarl of Ravensthorpe, though you wouldn't be getting much utility out of Chapter IV
For example, if Strata Scythe's imprint ability ("When this Equipment enters, search your library for a land card, exile it, then shuffle.") triggers twice (probably because it somehow entered attached to Cloud), up to two total land cards can be exiled
They may both put you in a solid position to collect more lore, but without side effects, neither is undefeatable