As an Affinity sideboard card against decks like Jeskai or Grixis, theres no better way to keep applying pressure in an unexpected way than to bring a few Faeries to the party
Hymn is a cheap two for one and it is disruption which isn't something you can easily find on other cheap card advantage cards
It also clears the way for black-based aggressive decks , making it a key tempo card in many situations
Save boosters for the thrill of discovery, not for completion
Some EDH decks just want to ramp into Kozilek, cast it, draw cards, and sometimes even attack and decimate a board
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