Frickin Deadpool has just handed me my bum several times in a row, by sniping at me from cover....
MMK
Kirigi
Black Widow
Coach
Deposed
Out of the Darkness
Overexposed
Luke Cage
Mr. Code
Boss of Bosses
Good Night, Sweet Prince
Shadow Step
Psychoville
MAV
Pym Laboratories
Nighthawk
The Wrecker
Insect Swarm
MXM
Caliban
Sewer System
Sabretooth
Lots more in DC sets and in Marvel sets past MXM, but you don't have access to that stuff.
Your best generic options are probably Insect Swarm for versatility or Out of the Darkness for the added pump.
How I got that info:
http://www.io.com/~docx/vs/search.php
Learn it, use it, live by it.
It's amazing what you can do with partial result matching. For example, I did a search under Card Text for "hidden character". That primarily gave me two results-- bonuses to hidden characters, and ways to hit hidden characters.