Play digimon from the trash for free.
Skullmammothmon lets you play lvl 4 or lower digimon from the trash everytime a card is discarded from your hand, pairing it with Wizardmon's inheritable you can play DarkLizardmon and attack with rush, gaining a memory if you have Bluemeramon or Ignitemon under your main stack.
Akihiro is added so that we can trigger Skullmammothmon's effect at the end of the opponent turn, setting up for another Skullmammothmon stack or more quick checks, gain even more memory if Matt is in the field unsuspended.
Pumpkinmon is added as a tech so you can play it for 6, play an Elecmon from trash to trigger it's On Play and drop another body with Skullmammothmon's effect, 3 bodies for the cost of 1.