Board Thread:Questions and Answers/@comment-27148645-20151129011808/@comment-26539661-20151129014036

Never sell of XP, use all of them.

Surfer is an extremely good anti-alien, you will need him for Into the Future.

Pogo isn't that good, but still keep as it helps user rank.

Onmyoji is extremely good as it can debuff any unit (except metals)