I need to stop you there, the combo does not give him charge, because the summoning sickness tag it's still there the turn you play Giant Sand Worm (I read a forum about that and this was the conclusion).
Minions enter the battlefield in a state of exhaustion AKA summoning sickness AKA Sleeping (indicated by a "zzz" above them), and cannot attack while they are exhausted.
My combo for 16 damage face works if somehow the 8/8 you played last turn somehow survived and. Then the rest of the steps in order for the combo are as I explained above.
I understand that completly.... I know that The Beast Withing dont give a "charge" effect but triggered Giant Sand Worm who can attack face at the same turn of his summoning..... just like a "CHARGE" effect but way way more difficult for explaining LUL
How i told you and before... in conclusion of logic your combo will works .... but will be very very situational and hard to be triggered.