Breaching Leviathan

A nine-mana 9/9 that walks out of a blue deck and freezes the rest of the board solid: the enters-the-battlefield trigger taps every nonblue creature and locks it down through its controller's next untap step, which in a multiplayer game means a table of opponents staring at tapped boards while a colossus starts swinging. The conditional is the price. The trigger only checks "if you cast it from your hand," so reanimation, blink, and the various cheat-it-into-play tricks that a body this size invites are explicitly walled off; you pay the full nine to get the lockdown, or you get nothing but a vanilla fatty. That clause matters because the temptation with any expensive Leviathan is to skip the mana, and this design refuses to reward it. The "nonblue" rider is the other deliberate seam: it spares your own blue creatures and any blue opponents, turning the effect into a mono-blue mirror-breaker rather than a symmetrical Tangle. As a one-sided board freeze stapled to a hard-to-kill threat, it belongs to blue's long tradition of "stall everything while my big thing wins" finishers, closer in spirit to a mass tapper than to a counterspell. The body is the follow-through: the freeze buys one clean turn to attack before those tapped nonblue creatures wake up, and a 9/9 makes that turn count.