For those who are confused by the flavor text, let me explain
At the beginning of your end step, exile target noncreature, nonland card from your graveyard

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Land Color tag templates(None) Radiant Fountain When this land enters, you gain 2 life
Its most common appearance is in Legacy lands decks, where it is the centerpiece of the whole strategy
Madam Mim Snake makes your exert and Rush characters more valuable, and Madam Mim Fox does the same with added Rush