Its particularly strong with creatures that generate value when entering or leaving the battlefield
It reads like Pay nine mana: do some goofy nonsense and that came with this subtext: put this in your trade binder and hope someone who plays multiplayer wants it. Its possible that its too vulnerable to counterspells or the traditional problem that you might just not draw it or something, but its a hard reset that gets you out of any board and works in ways that can be pretty straightforward to abuse
Because while for his teachers it is merely a distracting piece of sparkly cardboard, for this eight-year-old boy, its the fire-spitting monster that hes been chasing since the start of term
1 Emrakul, The Aeons Torn Is A Game-Ending Card Emrakul, The Aeons Torn is possibly the single most powerful Magic creature to have ever been printed (outside of an Un-set)
But Cradle is good because it enters play and immediately generates mana
Spells like Scooch can change the result to 0 or 7, for example