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It's better in decks than in mono-green ones, thats for sure

It won't change a roll of the planar die, but you might get to say something like "I rolled chaos plus 2," which is a pretty cool thing to say

I'd like to give a brief shoutout to some other Planeswalker Commanders that work well with Doubling Season (but not enough to be honorable mentions)

Rays of Judgement 3R Instant Rays of Judgment deals 5 damage to target creature and X damage to its controller, where X is the number of equipment you control

Tymna's a top-tier competitive commander due to its generically useful card draw ability, its relatively low mana value, and the fact that partnering it gives you access to more colors for your deck