Stickers can't remove flavor text, even if they are physically covering the flavor text
How does Cascade work with double-faced cards

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You must make sure Doomskar is clearly visible as a face-down card, but with how complicated board states get in Commander the last thing on your opponents mind is your face-down spell
After doing this comparison, I understood that a good, vanilla creature that costs 2 of the same colored mana will have a power and toughness level of 2/3