when needing to digivolve into a level 6, this trick can earn you 5 memory (kinda), if the shuffle worked in your favor. Using a combination of Parabolic Junk (BT6-104) to curse the digimon you'd plan to delete as the sacrifice digimon in Alice McCoy (EX2-064)'s ability, level 6 digimon with digivolution cost of 5 would be free. If the cost is 3, you'd at least earn yourself 2 memory. If the cost was 6, you'd ony pay 1 etc.
Also Takumi Aiba (BT5-091) i thought was essential to ensure your opponent doesnt plan on rushing you out the gate, so you'd get a better chance of building your playfield or breeding area a bit, stress free ?