Flintlock
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On my starting team one of my characters is Quake with a Flintlock. Can I sideboard in Fortress Maximus if I also put Flintlock on him? [Source: WotC]You can't play Fortress Maximus without also playing Cerebros, and vice versa. Since you can't put both in your sideboard because you're only allowed one character in your sideboard, you can't sideboard Fortress Maximus in any effective capacity.