I had the same experience as another player reported.

My opponent had Champion of the Weird and used the card's ability on their turn to force me to Blight 2, putting -1/-1 counters on my creatures.

I had Lasting Tarfire in play.

Lasting Tarfire says at the beginning of EACH end step, deal 2 damage to opponent if I put counters on my creatures. This effect did not trigger at the beginning of my opponent's endstep.

This happened at least 3 different turns during the game and was my final loss of the draft event, and I believe the game would have had a different outcome if the Lasting Tarfire dealt the damage I think it should have.

Is there any reason this effect would not have triggered? I have the log file, but this site will not let me upload it. It is log # Log20260121_184937