TMNT Turtle Team-Up: My Favorite Mechanism

About Magic: The Gathering – Teenage Mutant Ninja Turtles Turtle Team-Up, from BoardGameGeek:

Splinter's students are taking on the Foot Clan, and they need your help to win! Enter Turtle Team-Up from Magic: The Gathering | Teenage Mutant Ninja Turtles, a fresh way to play Magic with your friends. Here, you're not competing against each other. You're uniting against a horde of Shredder's minions and the Turtles' many foes. This experience is designed for two to four players, with an average game length of about 45 minutes. It's a great way to play with a new player or just bring a fresh spin to your Magic nights.