Galacticmon

[When Digivolving] By placing 4 cards with [Vemmon] in its text from your trash as this Digimon's bottom digivolution cards, you may use 1 [Ragnarok Cannon] from your hand or trash without paying the cost. [Start of Your Main Phase] Delete 1 of your opponent's Digimon. [All Turns] When this Digimon would leave the battle area, by returning 4 [Vemmon] from its digivolution cards to the bottom of the deck, it doesn't leave.

Alternate effect

[Digivolve] [Snatchmon]: Cost 9