End Step Triggers
End step creature death triggers not triggering
1. Barrensteppe Siege is in play
2. Creature with mobilize attacks
3. Beginning of end step, tokens are sacrificed (die)
4. Siege should trigger opponent to sacrifice a creature, but it does not
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Rezzahan#77802
commented
Siege had its opportunity to trigger, but its trigger condition wasn't met, so it did not trigger. Siege's Mardu trigger has an intervening-if clause, which is an extension of the trigger condition, and has to be true at the time the ability would trigger, or it doesn't trigger. Any creature death IN the end step CANNOT satisfy a required creature death AT THE BEGINNING of the end step. Mobilze token sacrifices CANNOT satisfy the if-clause, because they happen IN the end step, long AFTER it began.