Rule 207.4 · Text Box
The chaos symbol appears in the text box of each plane card to the left of a triggered ability that triggers whenever chaos ensues. The symbol itself has no special rules meaning. See rule 901, “Planechase.”
Ask the judge Pro
The life counter has an AI judge that answers your play citing the exact rules. It is part of Gatewatch Pro; the rules, Oracle text and rulings stay free.