It's an unparalleled cantrip effect that regenerates your options out of nowhere
Additionally, the Oculus archetype had a terrible weekend in competitive events, which could cause demand to drop for Pest Control
Rosewater, Mark Subject: Crackle Off the top of my head though here are some cards that are "too powerful to bring back" that might be exciting to reprint in purple, along with what it would mean for the color's section of the pie: Mana Drain (countermagic) Fireblast (direct damage) Hymn to Tourach (discard) Rancor (trample and creature pump?) Land Tax (taxing) Land Grant (land search) Sylvan Library (deck manipulation) Dark Ritual (fast mana) The cards that really help to define the color, like the first three, seem better because their inclusion makes a lot of other cards make sense
A collective of +1/+1 counters decks, Voltron decks and Enchantress decks cried out Yes please, I hate Spore Frog! This reject from Toy Story is creepy, but also very effective at closing games
It fits best in decks that want to cast spells repeatedly over time rather than chaining them all in one turn