Rite of Harmony is a rare Instant card from Innistrad: Double Feature (DBL), collector number 236. Current market price: $4.22 (foil $5.18), TCGplayer market prices via Scryfall.
Whenever a creature or enchantment you control enters this turn, draw a card. Flashback {2}{G}{W} (You may cast this card from your graveyard for its flashback cost. Then exile it.)