In cEDH (competitive Elder Dragon Highlander), the Marvel collab can see some play, specifically in the form of Storm
But its real purpose is its other ability: Whenever a creature an opponent controls is dealt excess noncombat damage, amass Orcs X, where X is that excess damage. It can be a great source of Amass Orcs and it is a part of a 2 card combo with Blasphemous Act that results in near-infinite +1/+1 counters on an Army token and near-infinite damage to all creatures
Mark cards owned or wanted, add condition & notes, and watch your master set progress
The allure of Snapcaster Mage is that you get to do things at instant speed
If your life total is brought to 0 or less at the same time that nontoken creatures you control are dealt lethal damage, you lose the game before Judith's triggered ability goes on the stack
If youre looking for a modern leader with a strong, universally useful effect that can compete with OP13 staples like OP13-079-imu and OP13-002-portgasdace, this new Vivi is definitely worth trying