Abilities of emblems function in the command zone.
May 3, 2019 · War of the Spark
Some spells and abilities that refer to damage require “any target,” “another target,” “two targets,” or similar rather than “target [something].” These targets may be creatures, players, or planeswalkers. Other game objects, such as noncreature artifacts or spells, can’t be chosen.
January 25, 2019 · Ravnica Allegiance
Some spells and abilities that refer to damage require "any target," "another target," "two targets," or similar rather than "target [something]." These targets may be creatures, players, or planeswalkers. Other game objects, such as noncreature artifacts or spells, can't be chosen.
April 27, 2018 · Dominaria
Some spells and abilities that refer to damage require “any target,” “another target,” “two targets,” or similar rather than “target [something].” These targets may be creatures, players, or planeswalkers. Other game objects, such as noncreature artifacts or spells, can’t be chosen.
July 16, 2010 · Magic 2011
A spell or ability on the stack is an illegal target for itself.