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The Courts Monarch is a mechanic that doesnt exist in a game of Commander until someone plays a card that introduces it

You can't mutate for free Effects like Cascade or spells like Omniscience allow you to cast spells for free

Granting double strike to every dragon that attacks turns even modest boards into terrifying threats

Answer: because the design team told us so, loudly and repeatedly

Card Advantage, Permission, and Threats Mana production aside, the cards in a blue-based control deck can be separated into one of three classes, card advantage spells, which allow you to draw extra cards or search for cards and add them to your hand, permission spells that deny your opponent their plays, or cheap threats which can close out the game once the opponent's game plan has been thwarted