Talk:Invincible Defense/@comment-2001:D08:1100:5CD:B4A7:2593:2F9E:6B7A-20171127150223/@comment-33415986-20171127162652

My most rational way, if its a good card I'm going to use is to use 1 baby harpy, that guarantees you skill lvl5, and afterwards I only feed 5x identical cards as long as I can farm them.

If the card isn't going to be a part of any of my teams, I leave it on whatever skill level it achieved, until it is needed for specific stages.