Welcome the Dead takes a little bit of work, but if you can mill yourself a bunch in a single turn (and Teval helps you get there), it can generate a ton of Zombie tokens
These are typically green cards since green is the MTG color most associated with the power of nature, mana abundance, and lands
This can allow you to cheat in some ridiculous stuff for Bant mana, like Portal to Phyrexia in Commander, or rather unflavorfully, Doctor Octopus, Master Planner
Sometimes there are also special events where you can also win ICRs
Ledger Shredder | Illustration by Mila Pesic Birds are MTG cards that have the bird creature type
Most of the best utility lands enter tapped, but not Three Tree City, and even if you don't have the right creature types, you can still tap it for a colorless mana so it's not ever sitting around doing nothing