Here are a few anecdotes that I thought were important to capture, so you can see the crossroads between creative's and design's roles
It costs one more mana than Heros Downfall but will take out 98% of the things that spell will while also giving you scry 2, which is close in power level to drawing a card
It costs 3, which is great, its +1 is better than it looks, its -1 has a plethora of uses, and the ultimate ability creates the sort of chaos that's simple, fun, and memorable, as opposed to the chaos from cards like Possibility StormPossibility Storm and ScrambleverseScrambleverse
River Song River Song is crazy good and Im not even referencing the draw from the bottom of your library part
Thankfully, while Legacy did fall out of favor with The Initiative, its still playable in Commander games