For a long time, there has been a debate among Commander aficionados as to which is better: The issue was the more-expensive instant with exiling vs the sorcery, cheaper, but can hit lands
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If you choose the second mode and the creature you don't control is not a legal target as Archdruid's Charm resolves, you'll still put a +1/+1 counter on your creature
There are a few ways to influence casting cost, the cost-effective options are Thalia, Guardian of Thraben, Grand Arbiter Augustin IV, and Lodestone Golem
