You can pay additional costs such as kicker costs
Three mana to Impulse for a creature is awful and not something Id even pay 1 mana for
Bedlam Reveler Bedlam Reveler has found its way into quite a few decks over the years, most recently finding a home in Value Vintage
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Swinging out is the easiest way, but you can also drain your opponents' life with cards like Ayara, First of Locthwain, Valley Rotcaller, and Mirkwood Bats or sacrifice your Rats to kill the table with a Blood Artist, Zulaport Cutthroat, or Syr Konrad, the Grim
You may need to test around which combination works best for your preference