Rulings
Q1: Can I use this card’s On Play When Digivolving effect to place just 2 cards in digivolution cards when I have 4 level 5 or lower Argomon in my trash?
Yes, you can. The effect reads "up to 4," therefore you can place any number from 1 to 4.
Q2: When I use this card's On Play When Digivolving effect to delete up to 4 levels' worth of Digimon, can I delete my opponent's "Lv.-" Digimon?
No, you can't. "Lv.-" Digimon don't have a level, therefore they can't be chosen as targets for an effect that deletes up to 4 levels' worth of Digimon.
Q3: BT17-048 Argomon was deleted while it had an Argomon with an On Deletion effect in its digivolution cards. I first used BT17-048 Argomon's On Deletion effect to play this card. At such times, if I use this card's On Play effect to place Argomon in digivolution cards before activating the On Deletion effect, what happens to that effect?
If a card is removed from the trash before a triggered On Deletion effect activates, that On Deletion effect can't be activated.
Data Sources
Lv.6 Argomon BT17-051 SR Mega | Virus | Mutant [Digivolve] Lv.5 [Argomon]: Cost 4 [On Play] [When Digivolving] You may place up to 4 level 5 or lower [Argomon] from your trash as this Digimon's bottom digivolution cards. Then, delete up to 4 levels' total worth of your opponent's Digimon. For every 2 [Argomon] in this Digimon's digivolution cards, add 1 to this level deletion effect's maximum. [All Turns] This Digimon gets +1000 DP for every 2 [Argomon] in its digivolution cards. [Opponent's Turn] None of your opponent's Tamers can unsuspend.
Lv.6 Argomon BT17-051 SR Mega | Virus | Mutant [Digivolve] Lv.5 [Argomon]: Cost 4 [On Play] [When Digivolving] You may place up to 4 level 5 or lower [Argomon] from your trash as this Digimon's bottom digivolution cards. Then, delete up to 4 levels' total worth of your opponent's Digimon. For every 2 [Argomon] in this Digimon's digivolution cards, add 1 to this level deletion effect's maximum. [All Turns] This Digimon gets +1000 DP for every 2 [Argomon] in its digivolution cards. [Opponent's Turn] None of your opponent's Tamers can unsuspend.
Lv.6 Argomon BT17-051 SR Mega | Virus | Mutant [Digivolve] Lv.5 [Argomon]: Cost 4 [On Play] [When Digivolving] You may place up to 4 level 5 or lower [Argomon] from your trash as this Digimon's bottom digivolution cards. Then, delete any number of your opponent's Digimon whose levels that add up to 4 or less. For every 2 [Argomon] in this Digimon's digivolution cards, add 1 to the maximum level you can choose with this effect. [All Turns] This Digimon gets +1000 DP for every 2 [Argomon] in its digivolution cards. [Opponent's Turn] None of your opponent's Tamers can unsuspend.
Lv.6 アルゴモン BT17-051 SR 究極体 | ウィルス種 | 突然変異型 Lv.5の「アルゴモン」:コスト4 【登場時】【進化時】自分のトラッシュから、Lv.5以下の「アルゴモン」4枚までをこのデジモンの進化元の下に置ける。その後、Lv.合計4まで、相手のデジモンを消滅させる。このデジモンの進化元の「アルゴモン」2枚ごとに、このLv.消滅効果の上限+1。 【お互いのターン】このデジモンの進化元の「アルゴモン」2枚ごとに、このデジモンをDP+1000。 【相手のターン】相手のテイマー全てはアクティブにならない。