If you have two Top Swap cards, you're able to juggle them. Perhaps a common in a set could be this creature here, where you're incentivized to "juggle" your cards by playing several?

The power is a CDA so that you can cast your spells whenever before damage is dealt, and it'll still work. Plus if you Fling it, its power will count the Fling in the number of spells you've cast.

I feel like this is a complete and elegant enough common as is. Maybe it even could be a 1 cost?