During your Deployment phase, you alternate 3 actions to put 3 shield tokens (on valid targets) using Echo Base Shield Generator and take this card back to your hand.
Then you use 1 action to play it again.
You alternate 3 new actions to put 3 shield tokens (on other valid targetes).
What happens now?
Can you go on placing other shield tokens on valid targets, since the card won't "jump back" into your hand?