You and your partner conduct your draw phase, declare attacks, end the turn, and so on, all at the same time
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I suppose spirits make good use of it, and the incremental graveyard hates not too shabby either
Everything that is specified by the effect creating the original token or tokens will also be true about the additional token or tokens created by Doubling Season's replacement effect
That means taking a hard look at your mana base to figure out how many copies you can afford to play
Whether expecting high-end reprints in Commander decks is reasonable is a conversation for another day because today, rather than trying to place Commander 2019 into the context of past Commander releases, our goal today is simple: to figure out which Commander 2019 deck is best