Red is doing more and more "Exile-then-you-can-cast-it-from-Exile-until-whenever" stuff, and now we're getting stuff to encourage us to do this, even make it a sub-theme
It will probably be a net-gain for you overall, but the mana you give your opponent early can really come back to bite you
Make sure your main deck contains exactly the number of cards required for your format (typically 100 for Commander, while Standard, Modern, and Pioneer have 60)

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Pact Boon Whenever you play a card from exile, create a Treasure token