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352.8. A target is a valid choice if it meets all of the following requirements:

352.8.a. It is a permanent or rune on the board, a spell or ability on the chain, a player or zone, or specified explicitly or implicitly as being in some other zone. e.g., “Kill a unit” targets a unit on the board. e.g., “Recycle a unit from your trash” targets a unit card in your trash.
352.8.a.1. “Unit,” “gear,” and “rune” refer to objects on the Board unless specified otherwise.
352.8.a.2. “Spell” and “ability” refer to objects on the Chain unless specified otherwise.
352.8.a.3. “Facedown card” refers to a card in a Facedown Zone unless specified otherwise.
352.8.a.4. “Legend” refers to a legend in the Legend Zone.
352.8.a.5. “Chosen Champion” and “unit in the Champion Zone” refer to a unit in the Champion Zone unless specified otherwise.
352.8.b. It meets all targeting restrictions. e.g., A unit is a valid target for a spell that refers to a “unit at a battlefield,” “enemy unit,” “unit you control,” or “unit with Might 4 or greater” only if it meets the appropriate criteria.
352.8.c. It is not the spell or ability itself. e.g., A spell that says “Counter a spell” cannot target itself. e.g., An ability of a permanent can target that permanent, because abilities and their sources are separate objects.