Ursula's Return takes the famous Little Mermaid villain and places her center stage as the expansion's big bad, and also introduces the extremely hyped Sing Together mechanic, which has a chance to fundamentally change some of the strategies within the game's always evolving meta
Remember that if you want the Tardis version, surge foiling, or even a chance at the serialised Doctors then these Collector packs are your only option
While precons do make for great ready-made options, any reasonably mechanic-focused deck can work here
Creatures with indestructible are impervious to any effects that normally destroy creatures, such as: Damage (including combat damage) Any effects that destroy a creature This makes creatures with indestructible amazing in combat, since they can block or attack through just about anything
Its a classic strategy for a reason, and Watcher of the Spheres just upgrades the strategy more than ever