This effect is normally (see Gaea's Herald, Insist, Overmaster, Vexing Shusher). Untapping lands is green as well (though blue can do it too). I think this should cost or ... if you really want it to be three-colour, then . It'd be just odd for black (or white) to be in the cost of this.

I needed a Grixis instant with the name "unnatural edict". I can make it a different card.

This will almost always be 3 shard mana just to cycle a card, which is extremely weak. A more realistic compensation for failure to sacrifice would be draw 3, in the tradition of cards like Browbeat and Fatal Lore.

I think drawing two cards would be a good compromise between it being an uncommon and it being too weak

Hmm. So in a duel this is Inspiration, 1 mana cheaper but much more fiddly colours. With the drawback that an opponent will (once in a blue moon) sac something to deny you your draw. Not very good. However, in multiplayer its value skyrockets: even with just 2 opponents you're getting either 4 cards, or 2 cards and make one of them sac a creature.

Perhaps the value of this is a little too swingy with the number of opponents. Perhaps split the difference? "Draw two cards. Each opponent may sac... Then you draw a card for each opponent who didn't sacrifice a creature." That's better in duels - Jace's Ingenuity much cheaper, in exchange for fiddly colours and the out against a token deck - the same with 2 opponents, and less explosive with 3+ opponents (while still being clearly a multiplayer-scaling card).

noted

upped the mana cost.