Historical Rules · 25 January 2019
Rule 207.3
Official source text from the 25 January 2019 Rules release
Some cards have decorative icons in the background of their text boxes. For example, a guild icon appears in the text box of many cards associated with the guilds of Ravnica, and a faction icon appears in the text box of most Scars of Mirrodin(tm) block cards. Similarly, many promotional cards include decorative icons. These icons have no effect on game play.