[[App Fusion] [Sociamon] & [Gossipmon]: Cost 0]
If 2 such cards are linked together, stack the link card on top and digivolve.
[Blocker]
[On Play] [When Digivolving] You may link 1 level 4 or lower Digimon card from your trash or this Digimon's digivolution cards to this Digimon without paying the cost.
[Your Turn] Once Per Turn When this Digimon gets linked, give 1 of your opponent's Digimon" Start of Your Main Phase This Digimon attacks." until their turn ends.

Link Effect DP +4000
[Link] [Appmon] trait: Cost 3
(Plug this card from the hand or battle area sideways into the specified Digimon in the battle area.)
[All Turns] [Once Per Turn] When this Digimon would leave the battle area, by trashing 1 of this Digimon's link cards, it doesn't leave.