Rulings
Q1: Can I use this card's On Play effect to suspend either my Digimon or my opponent's Digimon?
Yes, either can be suspended.
Data Sources
EN
Official English Card Listworld.digimoncard.com
Lv.3 Mushroomon BT21-048 C Rookie | Virus | Vegetation/WG [Digivolve] Lv.2 w/[WG] trait: Cost 0 [On Play] You may suspend 1 Digimon. --- Inherited: <Piercing> (When this Digimon attacks and deletes your opponent's Digimon in battle, it checks security before the attack ends.)
A
Official English (Asia) Card Listen.digimoncard.com
Lv.3 Mushroomon BT21-048 C Rookie | Virus | Vegetation/WG [Digivolve] Lv.2 w/[WG] trait: Cost 0 [On Play] You may suspend 1 Digimon. --- Inherited: <Piercing> (When this Digimon attacks and deletes your opponent's Digimon in battle, it checks security before the attack ends.)
W
DCG Wikidigimoncardgame.fandom.com
Lv.3 Mushroomon BT21-048 C Rookie | Virus | Vegetation/WG [Digivolve] Lv.2 w/[WG] trait: Cost 0 [On Play] You may suspend 1 Digimon. --- Inherited: <Piercing> (When this Digimon attacks and deletes an opponent's Digimon, it performs any security checks it normally would.)