Whatever your reasons for targeting them, Triarch Stalker gives all creatures attacking the chosen player menace, making them more difficult to block and putting a huge target on the back of your chosen enemy
BT17-061 C Digimon Lv.3 Goblimon Color Purple Cost 3 DP 1000 Digivolve Cost 1 PurpleGreen 0 from Lv.2 Form Rookie Attribute Virus Type Demon Card Text 1 [Effect] [On Play] By deleting 1 of your other Digimon, delete 1 of your opponent's level 4 or lower Digimon
Also, since it is a permanent effect that negates and destroys, if it is an effect that targets, even a Counter Trap like Negate Attackcan be negate destroyed when the effect resolves
If the target creature is already tapped as it resolves, you will still create a Cursed Role token attached to it
A lot of new players use decks that friends give them, design for them, or recommend to them