arnak card sleeves Ark Nova Compatible Sleeve Bundle (SKS-8810 X 3) These are not penny sleeves they are 90 microns thick and will protect your cards for much longer and rougher handling than Standard Sleeves Lost Ruins of Arnak Sleeve

The counter adding plays into proliferate and leaders in Simic that care about counters

Rasmussen highlighted the storytelling elements when looking at this halfling who was designed using similar techniques to create the Mono Black Standard Staple Evolved Sleeper

Use the cards you milled to escape the Diamond, which you use to cast Brain Freeze again, and so on and so forth, until there's enough storm copies of Brain Freeze to mill your opponent

According to the PSA webpage, there are at least 47 of them out there

Gwen Stacy / Ghost-Spider Im not all that high on Gwen Stacy as a support piece, but it can make an interesting commander given the number of cast-from-exile payoffs we have