Outside of that, it's more of a collector's piece
If there's a cost associated with having a creature attack a player, its controller isn't forced to pay that cost, so it doesn't have to attack that player
Let's analyze them as potential Commanders for people in Commander
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Between Piper of the Swarm and Ogre Slumlord alone, your rats will be virtually unblockable
But both Izzet and Boros Aggro are amazing archetypes if you can get multiples of Burning Prophet