Bear in mind that ThankYou Points are permanently linked to the card with which they were earned. If you plan to apply for a card, collect $250 twice, and cancel, you need to redeem the points earned with that specific card before (or very shortly after) closing. Linking other cards to the same ThankYou Rewards account will not extend their life.
Thanks Mia. I plan on keeping the card. Just that getting the extra $250 makes you feel like you got a good wall!