This game has gone through a great many iterations, and as such, quite a few cards are no longer ever going to be in print (save for the potential dissolution of Wizards of the Coast's much-maligned Reserved List which may or may never happen, due to promissory estoppel)
This is one classic defender, and it's one of the iconic blockers for multiplayer formats
When you cast a spell that has Cascade, the spell goes on the stack, and then its Cascade ability goes on top of it
In terms of game design, merfolk have been treated as sea creatures in the broader sense
Hawkeye's triggered ability goes on the stack with no targets and no modes chosen
At the beginning of combat on your turn, create a 2/1 blue Phyrexian Myr artifact creature token