Willis

Effect

[On Play] [Start of Your Main Phase] 1 of your green Digimon gets +2000 DP until the end of your opponent's turn. [Your Turn] When one of your Digimon with [Terriermon] or [Lopmon] in its name is played, by suspending this Tamer, 1 of your Digimon with [Terriermon] or [Lopmon] in its name may digivolve into a Digimon card in the hand with the digivolution cost reduced by 2.

Source Effect

Security Effect [Security] Play this card without paying the cost.