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Some Upgrades say "Put on [something] only." How does that work?

These abilities describe what kind of character the Upgrade can be put on. This is usually a trait such
as Melee, Plane, or Insecticon. An Upgrade can be put on a character only if that character matches the
listed requirement.
Source: Wizards of the Coast (2018-10-11)    【Link to Ruling】
Tags: Upgrade