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.
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.)
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.)
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.)
Lv.3 マッシュモン BT21-048 C 成長期 | ウィルス種 | 植物型/WG 【登場時】デジモン1体をレストできる。 --- Inherited: ≪貫通≫(このデジモンがアタックしたバトルで相手のデジモンを消滅させたとき、アタック終了前にチェックする)