The deck is surprisingly powerful, able to quickly flood the table with a huge token army that keep you safe and finish off your opponents with lethal combats, but also has some incredible consistency in card draw, interaction, and protection (Ferrous himself comes protected by common removal spells like Swords to Plowshares!)
It has been dangerous in the past to allow decks to run low lands counts and still be able to cast spells
(If a permanent with a stun counter would become untapped, remove one from it instead.) If all targets of Crashing Wave become illegal before it resolves, the spell will not resolve at all and you will not distribute any stun counters, even if the opponent still controls some tapped creatures
In this case, that damage reduces your life total as normal.
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