Take that, Smartypants
From Archon Arcana
Take that, Smartypants • Brobnar • Action • Rare • Play: Steal 2
if your opponent has 3 or more Logos cards in play. • Artist: Caravan Studio • Card Number: CotA (011), AoA (050)

Commentary
Per the rules for Control, "If an ability refers to cards that a player “has” in play, it is referring to cards that player controls." Upgrades are controlled by the player who played them.