That would be the best target for a deck filled with cards that want a reduction like this
Their typical gameplan is to whittle the opponent's LP through a prolonged game, attacking directly through the effects of "Ghostrick Mansion" or "Ghostrick Museum", while protecting their face-down monsters and locking down the opponent
The Island, for example, features a serpent surrounding a mystical island, and the Mountain depicts a small, stone temple on a cliffside
This card's [Your Turn] effect triggers when a green level 5 Digimon attacks
Value when it comes down, then more value if it goes unanswered
If you want to learn, you can find all sorts of videos online or ask a teenager