[Endoperez]

An assassin, no matter how powerful, can't kill more than one commander/turn. IMHO a stealthy, flying SC would be insane, for the same reason as BigDisAwesome. Heliophagii are evil, especially if you've scouted/spied/Eyes of the God'ed out where the enemy is bloodhunting/making sages/researching/has rich provinces/has lots of magic sites. Only castles protect against stealthy SCs, and you can't castle all your provinces...