Your opponent’s keys cost +1
for each house represented among friendly creatures (to a maximum of 3).
for each house represented among friendly creatures (to a maximum of 3).“It scans as ‘mostly harmless.’”
Artist: Natalie Russo
Commentary
Upgrades enter play under the control of the player who played the upgrade. For this card, this means that it doesn't matter if it is attached to a Friendly or Enemy creature, the "You/Your" in the constant ability text refers to the person who played the card, regardless of which player controls the creature to which the upgrade is attached.
Source: Upgrades
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