Only permanents are legal targets for spells and abilities, unless a spell or ability (a) specifies that it can target an object in another zone or a player, or (b) targets an object that can’t exist on the battlefield, such as a spell or ability. See also rule 115.4.
April 28, 2017 · Amonkhet
There are eight special actions:
June 1, 2014 · Conspiracy
There are seven special actions:
July 16, 2010 · Magic 2011
There are six special actions:
February 1, 2010 · Worldwake
Other kinds of abilities and actions are automatically generated or performed by the game rules, or are performed by players without receiving priority.