Emet-Selch is, at the very least, a solid defensive body
All of the Dinosaur cards on this list boast rather intensive mana values
If most of your deck costs 5+, your commander and board never stabilize
It is a cool take on a stealing deck where Etali, Primal Storm and Lonis, Cryptozoologist would find a home (some of Lonis cards would be at home in there too), but in this deck it provides some treasure tokens for Gimbal, color fixing and can probably cast some really big stuff if you get lucky
Whenever that creature deals combat damage to a player, its controller may cast a copy of the encoded card without paying its mana cost.) Watermark: Dimir Illustrated by James Ryman Standard Not Legal Alchemy Not Legal Pioneer Legal Historic Not Legal Modern Legal Brawl Not Legal Legacy Legal Comp
On top of all that, Mangara, the Diplomat has lifelink, making it a great creature if you need to stabilize from a disadvantageous position