This proliferating can be turned into mana using Crystalline CrawlerCrystalline Crawler or Cryptic TrilobiteCryptic Trilobite, which can then be used to untap Tromell (via a card like Pemmin's AuraPemmin's Aura) and pay for its next activation
He's also a Druid, but you're also not going to get far by trying to build a mono-White Druid tribal Commander deck
I've either been happy using the other two abilities over again, or I've been able to ult but have declined because there wasn't enough value in my graveyard to make it worthwhile
2021-04-16 If you sacrifice a creature with a magecraft ability to cast Plumb the Forbidden, that creature's ability will not trigger.
These lands enter tapped, tap for a single color, and have cycling
It is especially strong against artifact removal as you can easily ensure you have multiple in play