This is pretty solid for the cost
Company: Pokemon USA Brand: Pokemon Series: Sun & Moon Unified Minds Item Type: Elite Trainer Box Release Date: August 2, 2019 UPC: 820650805844 Stock #: 294200 Our Guarantees to You, Our Valued Customer
Because it can be used to bounce back a land, it can keep folks from ever getting more lands in play than they have right now, barring an effect like Exploration or Explore that allows multiple lands to be dropped
I guess one attack from a Swans of Bryn Argoll, Tarmogoyf, or Slogurk, the Overslime should get the job done, but what about on an empty board
Genesis Supernova Spell Card/Quick-Play You can only activate 1 "Genesis Supernova" per turn
For only two mana, Tower Defense is an instant that provides all creatures under its caster's control with +0/+5