Despite being a rather heavy mana investment, Aesi combines some of the best land-related advantages on a single body
Most of the cards available at that mana value will send a creature from your graveyard to your hand instead, while Unearth returns it to the battlefield
The life loss is the main trade off for the power and I'm not sure if it's that bad since he has a transform condition that's tied to it
However, it also makes each opponent lose one life whenever a creature you control dies, and whenever a creature an opponent controls dies, you get to gain one life
Astrologians Planisphere This card I mentioned earlier is really interesting to me
For ten loyalty, you get an emblem that reads, Whenever an Artifact is put into your graveyard from the battlefield, return that card to the battlefield at the beginning of the next end step. Basically, it gives you a weird version of immortality for all of your Artifacts, and its an absurdly hard thing to beat