Artwork variants
2 printings of BT21-077. They are the same card for deck building — any of them fills the slot.
Regulusmon
- Level
- Lv.5
- Play Cost
- 7
- DP
- 7,000
- Form
- Ultimate
- Attribute
- Virus
- Traits
- Evil Dragon
- Digivolves From
- Lv.4 · Purple/Red · digimon · Cost 4
- Set
- BT21
Effect
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.
Inherited Effect
On Deletion You may play 1 level 4 or lower Digimon card with [Gammamon] in its text from your trash without paying the cost.
Track this card
Record how many copies of BT21-077 you own and DigiFoundry shows which are in decks, which are up for trade and which are actually available.
Printed In
- DIGIMON GENERATION [AD-01] Mar 2026
- WORLD CONVERGENCE [BT-21] Apr 2025
Rulings for Regulusmon
Official clarifications published for this card.
I chose my opponent's BT16-048 [TyrantKabuterimon] for this card's [On Play] [When Digivolving] effect. If BT16-048 [TyrantKabuterimon] then attacks and is suspended at the start of the main phase, does its gained <Collision> activate?
No, <Collision> doesn't activate. As soon as BT16-048 [TyrantKabuterimon] suspends, its [All Turns] effect prevents it from being affected by your effects, and <Collision> doesn't activate.
5 September 2025
I chose my opponent's BT16-048 [TyrantKabuterimon] for this card's [On Play] [When Digivolving] effect. If BT16-048 [TyrantKabuterimon] then attacks and is suspended at the start of the main phase, does its gained <Collision> activate?
No, <Collision> doesn't activate. As soon as BT16-048 [TyrantKabuterimon] suspends, its [All Turns] effect prevents it from being affected by your effects, and <Collision> doesn't activate.
5 September 2025
I chose my opponent's BT16-048 [TyrantKabuterimon] for this card's [On Play] [When Digivolving] effect. If BT16-048 [TyrantKabuterimon] then attacks and is suspended at the start of the main phase, does its gained <Collision> activate?Sep. 5, 2025 Updated
No, <Collision> doesn't activate. As soon as BT16-048 [TyrantKabuterimon] suspends, its [All Turns] effect prevents it from being affected by your effects, and <Collision> doesn't activate.
25 June 2025
Can I use this card's [On Play] [When Digivolving] effect to give "[Start of Your Main Phase] This Digimon attacks" to a Digimon that isn't affected by effects?
You can give that effect to such Digimon, but if the Digimon isn't affected by effects upon the trigger timing, the gained effect won't trigger.
25 June 2025
