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People love building around Sundial of the Infinite, and Time Stop is a super-powerful and popular effect in Commander because it can fizzle opponents mid-combo or mid-attack

You may move a Character to a Location on the same turn its played, and it doesnt matter if its exerted or not

It doesnt do anything else, just blows up the battlefield, leaving it clear for you to rebuild or for you to drop a planeswalker or two on your next turn

Giving your team hexproof is a great roadblock for your opponents since they need two pieces of interaction to kill anything that's not Sigarda, but the card advantage is what you want

In general, I would look at these two factors when looking to include cards not of your tribe's creature type: Is this creature so strong that it, on its own, is generally stronger than my tribal creatures when they are receiving bonuses and/or empowering my other cards