See Card74423. I'd rather not have a blatant hate card in the set.

You should probably add "you may" to the first line.

I'm open for "you may", but black sometimes gets enchantments that are not fully under its control as a theme; "bargaining for more than you wanted" cards.

If this were to be controlled, I'd probably make it Graf Harvest for Insects.

Looking further over the skeleton, this could be the token maker for (UB06) as well, so we free up a slot for interesting designs.

I would keep it compulsory, but I'd probably make it only be able to exile your creatures, so that stuff that trades with the tokens doesnt just fuel this card more.

Also, why is it for free? The upkeep trigger is detrimental, yes, but why should it make flying tokens for free, especially if you compare it to Graf Harvest? This is too strong, at 3 CMC you might already have a creature in any graveyard, and then you just start trading aggressively to fuel the graveyards.

He's not comparing it to Graf Harvest, he's saying if the creation was controlled then he'd make it more like that. This card is quite different.

This obviously draws parallels with Bitterblossom and although this costs more and needs you to have creatures in the graveyard to work it still might be too strong for a uncommon. I do like that it makes you want to play more aggressive to fuel it though.

I compare it to Graf Harvest, since it is the most recent token maker by exiling creatures from your graveyard. Don't think there is a might be too strong, this is definitely too strong. Let's refrain from making almost free token creator cards, especially in Uncommon. Bitterlossom wasn't reprinted for good reason.

You're probably right about staying away from this kind of effect

Bitterblossom wasn't reprinted because for a long time it was banned in modern. Not because it was specifically too strong.

There's also the fact that its a tribal card, but thats besides the point.