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Seedborn Muse is a five-mana 2/4 that allows you to untap all permanents you control during each other players untap step

When you cast an instant or sorcery with a mana value of three or more, you get to roll a d20 die

Besides creatures that make more creatures, ideal reanimation targets are creatures that have a big impact the moment they hit the battlefield, so that even an opponent holding Swords to Plowshares with available will have a hard time recovering from your unfairness

If your card has passed all the tests so far, its time to take a closer look

For a very solid and highly detailed look at this aspect of MTG collecting, I recommend this fantastic article by Guo Heng Chin