Sandswirl Wanderglyph Triggers
When I cast a spell, the Sandswirl Wanderglyph triggers to prevent me from attacking. However, when I attack, there is no trigger to prevent me from casting spells, it simply happens. If the first is a trigger, the second should be as well to allow me to respond with an instant.
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Rezzahan#77802 commented
Triggered abilities have specific wording: they ALWAYS use the words "when", "whenever", or "at" to indicate the trigger condition.
Sandswirl Wanderglyph's ability preventing an opponent from casting spells if they attacked you or one of your planeswalkers doesn't use the wording of a triggered ability, nor an activated ability. Thus it is a static ability, which conditionally shuts down the player's ability to cast spells. You are not meant to be able to cast spells once attackers are declared.