The basic template is: You may cast this spell by sacrificing a creature and paying the Emerge cost reduced by that creatures mana value. For Emerge from artifact, replace creature with artifact. The key idea stays the same: sacrifice the right kind of permanent, subtract its mana value from the generic portion of the Emerge cost, then pay whatever remains
Does Wilds of Eldraine once again capture the spirit of classic fairy tales
The format allows cards that are no longer in the current Standard rotation to be played
While you cant attack your opponent with Treasures (Under most circumstances), you can use them to power out huge threats, or fuel artifact engines like Mirkwood Bats
Its best to look at this as a cost reduction of three mana, as it can satisfy that much of the Harmonize cost on its own
It still triggers on-hit effects like lifelink, or triggered abilities that rely on a creature dealing damage