

Q1: This card's On Play and On Deletion effects have reduced the Digimon's DP to 0. In this case, will the Digimon be deleted before the rest of this effect is processed?
No, they will not be deleted at that time. After all of this card's On Play and On Deletion effects are resolved, all Digimon with DP 0 at that time will be deleted at the same time.
Lv.6 Magnadramon P-172 P Mega | Vaccine | Holy Dragon/Four Great Dragons/NSp When this card would be played, if [Nature Spirits] is in your face-up security cards, reduce the play cost by 4. <Blocker> [On Play] [On Deletion] 1 of your opponent's Digimon gets -5000 DP for the turn. Then, delete 1 of their Digimon with 5000 DP or less. ---
Lv.6 Magnadramon P-172 P Mega | Vaccine | Holy Dragon/Four Great Dragons/NSp [Digivolve] Lv.5 w/[NSp] trait: Cost 3 [DNA Digivolve] Yellow/red Lv.5 + green/black Lv.5: Cost 0 When this card would be played, if [Nature Spirits] is in your face-up security cards, reduce the play cost by 4. <Blocker> [On Play] [On Deletion] 1 of your opponent's Digimon gets -5000 DP for the turn. Then, delete 1 of their Digimon with 5000 DP or less. --- -
Lv.6 Magnadramon P-172 P
mega | Vaccine | Holy Dragon/Four Great Dragons/NSp
[Digivolve] Lv.5 w/[NSp] trait: Cost 3
{{DNADigivolveOr|0|Yellow|Red|5|Green|Black|5}}
When this card would be played, if [Nature Spirits] is face-up in your security stack, reduce the play cost by 4.
<Blocker>
[On Play] [On Deletion] 1 of your opponent's Digimon gets -5000 DP for the turn. Then, delete 1 of their Digimon with 5000 DP or less.