The thing is that finding those Rare Candies can be complicated
This week, that tribe is the Illusions, and we'll making lots of them, cheating mana costs and drawing lots of cards thanks to Minn, Wily Illusionist from the Adventures in the Forgotten Realms Dungeons of Death preconstructed deck
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It can also change if a second discard spell can hit the rebuy but not the main spell
Similarly, if you're not ramping, and ramping doesn't help you, why are you running Sol Ring
This card was upshifted to Mythic after its initial printing in Ravnica: City of Guilds, which means that it still holds a lot of value