During each player's turn, that player may play a land or cast a spell from among cards exiled with this enchantment, and they may spend mana as though it were mana of any color to cast that spell
Tivit, Seller of Secrets Im not fond of Tivit, Seller of Secrets, but Im also not dense enough to pretend like this isnt the best commander with the word investigate in its rules text
There are multiple cards that let you either gain lore, exert opponents, gain strength, or draw cards but only when an opponent has a damaged character
You can cast a single Zombie on your turn, and you dont even get a benefit for doing so
Plus, despite being three colours, two of those symbols are hybrid mana symbols, which means you can cast these using only red mana
Opt for those that give your HP regaining card at the right time