Mashup of Stonehorn Chanter and Celestial Flare

Taking everything from Stonehorn Chanter except the contents of the activated ability and replacing it with the untargeting creature destruction on celestial flare.

It feels like this must be broken but, oh well, every time I have one of these cards Royal Assassin says repeatable conditional creature destruction is strong, but not as broken as it sounds. I guess?

This doesn't target, so it's less good against an opponent with lots of creatures, but better against an opponent with one hexproof creature.

Suggestions? It'll normally be boring, but if you can use it at all, it'll hopefully do the job quickly.

That's one heck of an activation cost. I know you want to avoid "Ok, I'll activate this seven times, boom" but... wow; the chanter has that activation cost. What a ridiculously huge cost for that ability. Ok, for the sake of the merge, I guess. Normally boring; but this will block+kill one creature, plus force a sacrifice of another. A player whose game-plan is to attack with a fatty or two will be completely shut down by this. So it's got appeal for those who like white's game plan of "Sit back losing, and then reverse it" Especially as it then works on the offence too.

I'd run it.

Looks strong but fair. I've always liked Wing Shards effects. Spurnmage Advocate was a lot cheaper but made you jump through rather more of a hoop. Rare is probably the right place, though at 6 mana and 6 mana I could see this at uncommon too.

Yeah, I hesitated over uncommon/rare. I think usually it would have and be cheaper and rare, but I decided the repeated activation just about justified rare, even though the card is less outstanding than an average rare in most ways.