Nature's Rhythm
Sorcery
Oracle Text
Search your library for a creature card with mana value X or less, put it onto the battlefield, then shuffle. Harmonize
(You may cast this card from your graveyard for its harmonize cost. You may tap a creature you control to reduce that cost by an amount of generic mana equal to its power. Then exile this spell.)
Rules for this card
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A keyword ability that lets a player cast a card from their graveyard for a specific cost and lets them tap a creature they control to reduce that cost. See rule 702.180, “Harmonize.”