Following scenario:

1. You start, play a land and drop a Sensei's Divining Top.
2. Your opponent plays a land.
3. You play a land and a Counterbalance. In response to your Counterbalance your opponent plays a Mystical Tutor and searches for his Krosan Grip; you can assume now, that he's playing Stormcombo
4. Your opponent drops his second land.
5. You play a Brainstorm, draw 3 cards and you now keep a single card in your hand with converted manacosts 3. You put back two cards, the one that is now on top, is the one that costs 3.
6. Your opponent drops his third land and passes the turn.
7. You untap and look at the top three cards during you upkeep. The three cards you see show still one one card with converted manacosts 3.

Where do you place the card with cc3 and why?