Rok

You can only announce to activate Rok if you have no cards in hand at that point in time. The number of cards in your hand is checked before you pitch for resources.

If a prevention effect tries to prevent damage from Rok, each replacement effect will still try to do everything else other than preventing that damage. E.g. a card with Ward would still be destroyed.

Players can still attempt to prevent damage (apply optional prevention effects) even when the damage cannot be prevented.

An ongoing-prevention effect does not have its prevention amount reduced when the effect does not actually prevent any amount of damage.

Rok.