Ready to Rumble interaction with Magma Pummeler
Magma Pummeler has ability that says if it receives damage, prevent that damage and remove that many +1/+1 counters instead, then if damage is prevented this way, it does that much damage to target. Ready to Rumble does 5 damage and says that damage can't be prevented this turn. A plain reading of the text would suggest that this should cancel Magma Pummeler's replacement effect, and since it couldn't prevent the damage, it would not be able to do that damage to another target. However, when Ready to Rumble is used on Magma Pummeler, Magma Pummeler still does the damage to another target.
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[Deleted User] commented
The imbedded trigger has a trigger condition of "when one or more counters are removed", so it isn't dependent on damage being prevented. And the removal of counters is also not depening on the damage being prevented. So when damage can't be prevented, the game does as much as it can, meaning removing counters. Which in turn triggers the embedded trigger.