Friendly
From Archon Arcana - The KeyForge Wiki
If a card ability refers to a “friendly” game element, it refers to an element currently under the control of the same player.
—Official rules v1.8 March 2021
Commentary
Based on the ruling for Nexus and Shard of Greed, a card that is being treated "as if it were yours" is considered to be friendly for the purposes of resolving the ability text.
Source: •Shard of Greed•