Posting in case anyone else didn’t know either. Harmonize is cast from Graveyard, and you can tap creatures to reduce the cost by 1. Had trouble finding it, as there’s also a card named “Harmonize”.
I think “Harmonize” is a fine name for both the card and the mechanic but it’s weird that there’s really no similarity between the two. Maybe some yet-to-be-spoiled card will combine the mechanic and the draw effect.
As for this card… doesn’t seven mana seem like a lot for the Harmonize cost? The cost on Roamer’s Routine seems a lot more reasonable. I feel like they were worried this one would be broken and costed it very conservatively. But it’s probably a medium-high pick in draft even so; I mean, removal is removal.
Yeah I too think it’s overcosted for a flashback Shock but it seems like the Harmonize ability reduces the cost by the tapped creature’s power (not always {1}) which does help a bit.