On April 22, Wizards of the Coast announced that they were unbanning five cards in Commander and moving them to the Game Changers list that supplements the experimental 1-5 bracket system
Prices are going crazy, and if you're getting a collector's edition
PSA offers the option of listing newly graded cards on eBay, so you can auction your graded cards if you want to sell them
Its still an absolute nuisance in casual Commander, usually paired with Time Sieve for infinite turns
It may not really be an actual variation, since its misprinted, but I still think its worth mentioning here, considering most of these stamp variations are misprints to begin with
Each of them offers a buff to your creatures with a single specific creature type