Um... given the combination here of firstest-strike and frenzy; why not just have this be a "4/4 first strike"? It'd be exactly the same 99% of the time, and a lot easier to read.

Also consider:
~ does not die, instead when it takes lethal damage, it is sunk.

The effect allows you to kill a creature other than the one that blocked :P

Ok, 95% of the time, then.

Do you not understand what provoke is? This is closer to provoke than first strike.

Yes, I understand. I'm just saying that very very rarely will this be usefully different enough for the extra words needed.

Then you don't really understand the purpose of provoke.

This is Laccolith Warrior (but 4/4 rather than 3/3), almost precisely. It's pretty odd for white/blue to be able to shoot any arbitrary creature that's not involved in combat.

I'm guessing Vitenka hasn't played with the Laccoliths. They're pretty cool for being able to shoot down annoying utility creatures. (Even ones that tap, like Wellwisher, which provoke was useless on because it could always tap to make itself unable to block.)

Well, the blue presumably comes from being a boat. If it was shoot at any blocking creature; that'd be whiter I guess.

I guess that, at size 4, not blocking as a way to prevent it shooting stuff becomes harder to swallow. (And Alex: I thought provoke read 'untap target creature, it blocks...' nowadays?)

Taking out frenzy and making it explicitly part of the main ability does make it read a lot more simply.

Flavour's still pretty odd though "I can fire my main guns at that guy over there - but only if someone gets in my way."

If someone gets in its way, then it can't fire its guns at the player (but can still fire at any creature). I do like the wording on Laccolith Warrior, it works better. Decided on the power and toughness before making the ability, probably a bit OP.