Rule 355.10.b

It is included only as part of a targeting restriction for another choice or only as a restriction or permission for a game action. e.g., “Kill a unit at a battlefield” targets a unit, but not a battlefield, because the units are targets and “at a battlefield” is a restriction. e.g., “Kill all units at a battlefield” targets a battlefield, but not any units. e.g., “Play a unit from your hand to a battlefield” doesn’t target a battlefield.