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


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