Exiling three or four cards goes a long way
Some Ur-Dragon commander decks don't actually use all five colors and never plan to play it, and while it could just sit and be a 10% off coupon in the command zone, it just is too good an effect to pass up
Feed the Swarm only costs 2 mana, but youll have to pay life, which can be a pretty big sacrifice depending on what you want to destroy
The downside is that on your upkeep, you flip a coin and take 3 damage if you lose
Even if you don't want to bounce it, slotting it in a removal slot might be something you can do if you want more effects out of your spells, and it's a permanent if your deck cares about that
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