I dont care about rarity, more about function
You can ignore the coin part, but his enters trigger is going to draw you at least 1 card with regularity, and you'll draw way more in a deck like Blue/White
Knock your opponents upside the head with it, safe in the knowledge that youve added another piece to every combo players to-do list before they walk out the door with the game
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Sacrifice after IV.) I - Sonic Wings - Each opponent chooses a creature with the greatest mana value among creatures they control
Also of note, Kykar triggers on every noncreature spell you cast, not just instants and sorceries, meaning your mana rocks and supporting enchantments will make Kykar just that much more useful