Unlike most TCG cards whose value is driven purely by playability, the most expensive One Piece cards derive their value from extreme scarcity
It appears to be identical to morph except that the creature has an additional ward 2 while its face-down
A nice backup win condition I like as well is Magistrate's Scepter + Tekuthal, Inquiry Dominus + Contagion Engine for infinite turns (if Scepter has a charge counter on it, activated the Engine to put 4 more counters on the Scepter then activate the Scepter to take an extra turn and repeat this infinite times)
While Invasion of New Phyrexia has to be cast at Sorcery speed, it has some big additions that make the card fantastic
Akiri, Fearless Voyager Akiri, Fearless Voyager can provide up to one card draw per opponent, provided you're able to attack each player with an equipped creature
Capable of being a surprisingly effective board wipe, Phyresis Outbreak makes Poison Counters hurt that much more