Ok so the strat boost don't expire after 3/4. After 3/4 they will be removed from the sets only and can't be acquired after that. When the next promo comes out and they disable the strat cards for this promo, Sanders will still work because it's part of his PU. Now the benefit to PU him up and adding the card is if your other DBs are not maxed out in MCV and MCV then they still get the +1 from Sanders.
Ok so the strat boost don't expire after 3/4. After 3/4 they will be removed from the sets only and can't be acquired after that. When the next promo comes out and they disable the strat cards for this promo, Sanders will still work because it's part of his PU. Now the benefit to PU him up and adding the card is if your other DBs are not maxed out in MCV and MCV then they still get the +1 from Sanders.