First, I will move Veemon from raising area to battle and declare attack (I don't mind if opponent block), then draw 1 due to digitama Demiveemon inheritable effect, let's say I draw 1 ZekeGreymon. (Now I have 2 ZekeGreymon, 2 Shoutmon-DX, 1 Gravity Crush, 1 Tamer Takumi Aiba)
Then I will play Takumi Aiba for 2 cost (my memory move to "0" now), I choose her because she will give draw 1 when I digivolve to any digimon by resting this tamer and I need to use white option card later.
Next I will play 0 cost red option card Gravity Crush to borrow 2 memories, then digivolve the LV6 Durandamon to SHoutmon-DX for 2 cost (my memories again move to "0") and put ZekeGreymon on top of Shoutmon digivolution source and delete 1 of opponent's digimon with 5000DP or less, draw 1 red option card Gravity Crush. Rest Takumi Aiba, trigger draw 1, let's say I draw a white option card: [BT5-109] Fuse into the Ultimate Digimon!!