As many times as you want, provided that you have enough energy counters to use the ability
He pretends to be playing along with this, and then while the hero is bound in the fight, he sets off The Plan
From Pyrophobia:Coward is a creature type
In this case riot also works really well because you get two choices: Either you use Burning-Tree Vandal to attack that same turn, which may mean its immediate demise but you prioritize drawing cards for the turn, or you give it a +1/+1 counter which can increase its chances of survival, allowing you to repeat the rummaging ability at least a few times
Diablos stats arent particularly high, with 2 each of Strength and Willpower, plus just 1 point of Lore
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