Just how small is the MCU?

The problem with the Infinity Stones is that they make the MCU seem very small – as said, the ones we already know are in one way or another linked to Earth.

But there is also another problem – thus far, they are the only powerful cosmic artifacts we have seen, and they’re known as having absolute power in this shared universe (save for the Casket of Ancient Winters). And this does make the MCU feel even smaller.

So are there any other powerful objects?

Then there is also the vault of Odin, which holds so many other powerful objects. But, so far, they have been only Easter Eggs. So what if, say, the Eternal Flame comes into play after the Infinity War? What if Surtur arrives and brings about the real Ragnarok, the real ending of the world?

And, since we mentioned the Mandarin in this list, what about his rings?