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Creatures like Woolly Thoctar suddenly swing far above their mana cost

That means you gain at least two permanents when it attacks, but you can bolster that greatly by simply adding in other sacrificial effects to your deck

But so many powerful cards are noncreatures

When calculating costs, begin with the mana cost of the Bauble:

You can find everything from Revised dual lands to Power Nine, and you'll even find some incredibly rare Richard Garfield celebration cards, which are holy grail collectibles for some MTG enthusiasts

If it is, there are only just above fifty cards that do that, so this might be at a premium