pokemon scarlet violet booster box & 151 Japanese Violet booster pack containing 10 cards and 1 basic Energy. Pokemon Scarlet and Violet Stellar

Activate only during your upkeep

I wont pretend that cheap, instant-speed interaction isnt good, but for spells like this to be good, you need ways to either recoup the card disadvantage (and have a lot of powerful spells) or to utilize the tempo advantage by attacking

For those who don't know, Gruul is

Pattern 3: Launch Spike 60-Day Correction High-rarity cards almost always spike on release day, then correct 20-40% within 1-2 months as supply stabilizes

Not to mention Perrin has a pretty helpful effect making her likely to see some play in decks like Lugia VSTAR that need specific Pokemon in play for them to work