Once you've used Sleep Mode's On Play effect to place [BT13-091 Belphemon: Rage Mode] on top of its digivolution cards, awaken to Rage Mode at the end of your opponent's turn
Such a card is too situational for me to ever run in a Commander deck, but tacking this on as an added bonus is fantastic, and sometimes will end up being the exact mode you need to stabilize
Cards like Nicol Bolas, Dragon-God, Geyadrone Dihada, and Tamiyo, Field Researcher all could hang out in the same deck
The sneakiness of replacing itself while benefiting opponents too makes it a unique counter worthy of Blue's bag of tricks
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distributor), production complexity (standard vs