Getting benefits for opponents doing things is usually whites thing (Monologue TaxMonologue Tax, Charismatic ConquerorCharismatic Conqueror, Smothering TitheSmothering Tithe, etc.), but this is actually a callback to the red card Harsh MentorHarsh Mentor, which deals two damage to opponents for using activated abilities
While I cant find anything confirming why this is, its likely because its on the Reserved List, so Wizards is hesitant to errata something they cant reprint
Beyond their blatant synergies, Preston can even go for a win in a single turn with enough setup
Although Kaladesh was a pretty well-received set when it was in Standard, its been out of print for quite some time which can lead to the prices for singles (including Inventions) being pretty high
Dumbo, Ninth Wonder Of The Universe $361.14 A Game Winning Card This card is so good, as it's a complete game-changer that can win games