It gains "You can't lose the game and your opponents can't win the game." Activate only as a sorcery
What makes these decks so strong against the aggressive decks is that they are packed full of permission, removal, and other strong cards that allow them to play a one-mana 5/5 that, in the case of Terror itself, is pretty difficult to remove (Ward 2 is insane when you consider a deck having to leverage multiple damage spells against it to get rid of it)
Purple Trafalgar Law is a Blocker that also lets you rip two cards out of your opponents hand if they have seven or more
With a full playset of Cinderella, Stouthearted, and some Hercules, Divine Hero, we'll still have some big threats on the board that can easily take out opponents even when they're not exerted
It boasts a bunch of alternate win conditions, plus combos like Maskwood Nexus + The World Tree, Biovisionary + Rite of Replication, and Triskaidekaphile + Drown in Dreams