Well, "overpowered" would imply that there's no cost-effective counter. Nominate those if you like, but some combos are just flavourful or fun even if they're expensive or vulnerable to special tactics. Who knows, maybe somebody will speak up who's in love with Lure of the Sea, in the right situation.
Likewise, game balance-wise it doesn't really matter that all the tricks Svartalfs can play are combined on one unit--it could just as well have been three/four units like the EA Agarthan Oracles--but the fact that it IS one unit adds a lot to the coolness factor for me.
-Max