Getting a colorless Karoo is great especially when it's on a Desert
In addition to the already mentioned Zellix, weve also got Extract from DarknessExtract from Darkness, Fractured SanityFractured Sanity, Nemesis of ReasonNemesis of Reason, Sewer NemesisSewer Nemesis, and two of the best mill cards in the biz, Consuming AberrationConsuming Aberration and MindcrankMindcrank
You still need to find lands and smooth your mana
Don't forget that, when a creature is protected this way, you tap it, remove all damage that has been done to it, and it is removed from combat
Morbius the Living Vampire Saffgor: This card is almost too easy to make fun of, but why could this not at least be a Strategic Planning from the yard
Until end of turn, Ursine Monstrosity gains indestructible and gets +1/+1 for each card type among cards in your graveyard