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It can also be used during the opponent's turn to bring one more interaction to the field

These are turn-based actions too, and they dont use the stack either

Promo Info BOOSTER BEGINNING OBSERVER [BT-16] CLOSECLOSE BT16-038 U Digimon Lv.3 Terriermon (X Antibody) Color Green Form Rookie Attribute Vaccine Type Beast/X Antibody DP 1000 Cost 3 Digivolve Cost 1 0 from Lv.2 Digivolve Cost 2 - Upper Text [Digivolve] [Gummymon]/[Terriermon]: Cost 0 [Your Turn] When this Digimon would digivolve into a card with [Gargomon] or [Rapidmon] in its name, reduce the digivolution cost by 1

Special Summon this card, then you can Special Summon 1 monster from either GY to your field, but send these Special Summoned monsters to the GY at the end of the Battle Phase

Test both numbers and find which works best for you

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