Two-drop mana rampers that tap for any color of mana regularly make big roads in formats like Standard, such as the aforementioned Caryatid
You can check it out here - (Animating Commander with Katsumasa | Article by Abe Sargent (coolstuffinc.com)) Today I am building around this popular leader who already has 1,268 decks registered over at EDHREC.com
5-Color Commander Payoffs Five color commanders mean you always have access to a 5-color card, so simple benefits for controlling more colors optimizes cards like Soul of Ravnica, Dragonfire Blade, and Case of the Shattered Pact
Note that this is a post about broken combo in Standard, and not one about Facing the Dragonstorm, which is just a framing device here for what I wanted to talk about really
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Having deathtouch and lifelink makes Yarok formidable in battle, but the real prize is its ability to copy "enter the battlefield" effects