Regulusmon [BT21-077] [World Convergence Release Event Cards]

[[Digivolve] Lv.4 w/[Gammamon] in text: Cost 3] [On Play] [When Digivolving] By trashing 1 card with [Gammamon] in its text from your hand, give 1 of your opponent's Digimon [Collision] and "[Start of Your Main Phase] This Digimon attacks." until their turn ends. [On Deletion] You may play 1 [Canoweissmon] or 1 level 4 or lower Digimon card with [Gammamon] in its text from your trash without paying the cost.