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The important part here is that youre going to want to have a creature at the ready that will guaranteed deal combat damage the turn Marisi enters play

The players can swap any number of cards between the decks, with the requirement that each deck must have exactly the same number of cards as it had before

As far as the slab is concerned, companies may sometimes source it from wholesalers

If your commander has multiple triggered abilities, or a static ability and an activated ability with multiple conditions, that can just be overwhelming, and you wind up missing out on opportunities to do good stuff because theres just so many options