Historical Rules · 10 August 2018
Rule 207.3
Official source text from the 10 August 2018 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 Ravnica: City of Guilds® and Return to Ravnica™ block cards, and a faction icon appears in the text box of most Scars of Mirrodin™ block cards. Similarly, many promotional cards include decorative icons. These icons have no effect on game play.