Unending Whisper

Cantrips have always been the cheapest thing to overpay for later: you spend one blue for the card now, and the spell is gone. Harmonize rewrites that math by leaving the graveyard as a second casting window, and the way it pays for itself is unusual. That six-mana recast looks steep for a single card, but you may tap one creature you control to shave the cost by that creature's power, so a lone hefty attacker sitting out of combat drops the recast down to a couple of mana. This design answers the flaw every card-draw spell carries: a cantrip only replaces itself in the late game, precisely when you most want to be drawing real card advantage off the top. This one is not. It waits in the yard until you have a big body to spare, converting one idle attacker into a fresh card without asking you to hold up a whole spell in hand. What it rewards is going tall rather than wide: the reduction reads off a single creature's power, so the deck that squeezes the most out of the recast is one leaning on beefy midrange threats, not a swarm of ones and twos. The exile clause is the honest limit: harmonize exiles the spell for good. Draw once cheap, draw again when a big creature can foot the bill, and then it is gone.