This will see play as both commander and in the 99 in big-spells decks, and its going to be popular
Having the ability to exile cards from an opponent's library, and then cast those cards for free on a later turn can be an easy way to completely shut down an opponent's deck
I would make a few adjustments to this list, especially if you plan to play best of one or an aggressive meta in general
Counterspells are a little too situational, and it is often just going ot be better to add to your board with three mana than count on your opponent playing something that you will counter
If it's three, ramping on turns two or three doesn't make you faster
However, as a seasoned Magic Judge, Id advise caution when using these dice and actually advise against using them in a competitive paper event