The rule says:"Surprise Strike (Ex): As a swift action, you can expend one use of mythic power to make a melee attack or ranged attack against a target within 30 feet, in addition to any other attacks you make this round. When you make a surprise strike, the target is considered flat-footed regardless of any class features or abilities it might have, and you add your tier to the attack roll. Damage from this attack bypasses damage reduction."
Now....this attack can be done only in "addition"? I mean can you make just a surprise attack in your round if you do not make any other attack? If for example you use your standard action to do something else instead of an attack or for some reason you can't make a standard action so you can't attack, can you make a surprise attack anyway? My doubt rise about the swift action....if you can use a swift action to make one attack everyone knows that after a swift action you can still make a standard and move or full round action so why to specify in addition to any other attack? I hope I made my self clear
Any can be 0. You are not forced to spend your standard action on anything else by using this ability.