Etemon

[On Play] [When Digivolving] Until the end of your opponent's turn, 1 of your opponent's Digimon gets -3000 DP and gains "[Start of Your Main Phase] This Digimon attacks."

Inherited effect

[Opponent's Turn] [Once Per Turn] When an opponent's Digimon attacks, you may reveal the top 3 cards of your deck. You may play 1 black or yellow Digimon card with a play cost of 3 or less among them without paying the cost. Trash the rest.

Alternate effect

[Digivolve] Lv.4 w/[Sukamon] in name: Cost 3