Arvad, Weatherlight Smuggler does not trigger his ability
Arvad, Weatherlight Smuggler does not trigger when:
You have creatures with Mobilize
and creatures with decayed
Have Arvad and Jadar -> attack with the zombie, sacrifice it... turn ends and does not trigger +1+1 on Arvad;
Have Arvad and some creature with mobilize, has the same result.
However, If you have another trigger in the end step, then arvad does count the sacrifice properly.
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Rezzahan#77802
commented
Mobilize tokens and other "at the beginning of the end step" sacrifice triggers make the creature die too late. Arvad's trigger has an intervening-if clause, and that clause must be true at the time the ability would trigger, or it does not. Think of it as an extension of the trigger condition. Meaning, a creature has to die BEFORE the end step begins to get the trigger.
The decayed sacrifice at end of combat should work, though.