If you pay for each, two new combat phases will be created
Targeting the opponent can be upside in some spots, but a liability in others, and on the whole, Id call it a wash
In fact, I don't even think that this one is necessarily the best
The treasure-making effect alone makes Kenway a decent choice to slot into existing pirate commanders, namely both versions of Admiral Brass
The balance of building your board state and spacecraft while you lay down land after land puts space exploration on display
Entomb and the fixed version of it, Unmarked Grave, are far more flexible, allowing you to set up spells with flashback like Past in Flames, additional static benefits through cards like Riftstone Portal, or simply open up more targets for you to recover through an Eternal Witness