When you draw a card, if Chewbacca is in the Character arena, remove 1 damage counter from one of your Space or Ground units.
Pay 1 Force Retaliate 2
Chewbacca's ability to remove damage counters triggers whenever you draw a card, whether that is during your draw at the beginning of your build step or as an effect that happens at some other time. But his effect doesn't resolve until all cards are drawn and the card draw effect ends. For example, If an ability causes you to "draw 2 cards then discard 2 cards," Chewbacca (B)'s damage removal effect triggers for each card drawn, but doesn't resolve until the draw effect resolves after 2 cards are discarded.