You only can use this effect 2 times per Duell
Even if what you target isnt that big, being able to draw three or four cards is already a considerable advantage
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The raging waters had swept away trees, bridges, and even houses
However, they provide great defense and surprisingly good utility, and there are a number of sneaky ways to make walls attack using their massive toughness stats, often wiping opponents out
If another effect (or effects) modifies how much damage a source you control of the chosen type would deal (for example, by preventing some of that damage), the player being dealt damage or the controller of the permanent being dealt damage chooses the order in which any such effects, including the effect of Collective Inferno's last ability, apply