Lets assume for a moment that an opponent has Odric, Master Tactician in play, which will help them orchestrate devastating combat steps
Shellshock acts as both removal and a resource generator, making it a high-value inclusion for any Red deck that cares about artifact synergy or the new Disappear triggers
Also sneaking in at above $10 was Karlov of the Ghost Council , with a value of around $13, and Lord of the Void , with a selling price of around $11
Richard and I had been brainstorming on ways to do two-state permanents
FromTheShire: Absolute worst case it's redundancy which is never a bad thing to have, but counters decks can easily be doing things on each turn to somewhat break the restriction and this has the upside of counting any permanents, not just creatures
With a good sea creature commander in Runo Stromkirk and typal support from cards like Serpent of Yawning Depths, the Leviathan has better synergy within its typal home than River Bear