Cometmon

＜Collision＞ (During this Digimon's attack, all of your opponent's Digimon gain ＜Blocker＞, and must block if possible.)
[On Play] [When Digivolving] You may link 1 level 4 or lower Digimon card from your hand or this Digimon's digivolution cards to this Digimon without paying the cost.
[All Turns] [Once Per Turn] When effects trash any of this Digimon's link cards, 1 of your opponent's Digimon gets -8000 DP for the turn.

[All Turns] [Once Per Turn] When this Digimon would leave the battle area, by trashing 1 of its link cards, it doesn't leave.

[Alt]
[App Fusion] [Warpmon] & [Weatherdramon]: Cost 0
If 2 such cards are linked together, stack the link card on top and digivolve.