Yes, you read that right: there was a card spoiled right before the prerelease of the set before the set the card is from
Its all incredibly silly.
Make sure you have enough ramp (mana rocks, land tutors) so you aren't stuck watching everyone else make big plays while youre tapped out
I think, just because it's attack is so good and its ability is so good -- and they kind of work together in that its ability is defensive, and it requires a lot of energy to attack -- I think that it will probably see play, but in a very specific deck that can support its energy requirement
(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