The blue Hippo. Both cards cost 2 and can be removed from the game disable an ice, but Hippo's destruction effect is more permanent and powerful. Capybara somewhat makes up for this with a trigger that is harder for the corp to play around and a lower influence cost (but factions importing Cap will also need some bypass effects).

I wonder what green river mammal will come in the next cycle? Perhaps a platypus?

Vandalising ICE? Running without breakers installed, then dropping a Slap Vandal at the last second? This is my kind of Identity! So, what can you use it on?

• Trojans: the obvious target
  • Botulus or Slap Vandal for instant pressure
  • Egret and Monkeywrench: pretty handy for Umbrella
  • Living Mural and Ika (yes, it got an errata to be a trojan): You might want to run both of these. Ika is very flexible and nice for Simulchip, while Mural adds value late-game and can work on multiple sentries (on a single server) while enabling umbrella.
  • Flux Capacitor, Pichação, and Kyuban: Of the three, the fish is the most straightforward value. Flux is perhaps "better" but wants your charge cards installed
  • Hush: probably a must-play to deal with Magnet.
  • Saci and Tranquilizer: I think we have better in-faction options for money and defeating ice
  • Chisel or Trypano: I don't think you want this, you want ice to stick around
• Emergency Breakers: you trash these after the run, so they are competing with Botulus/Vandal for utility. Perhaps best saved as a late-game tool when the corp thinks you're locked out of a scoring remote.
  • Mayfly: perhaps you can Flame-out like Wu?
  • Abagnale
  • Cat's Cradle: Look, it's not a good idea, but you could surprise tax the corp
  • Chameleon: It won't save itself before Arissana trashes, it, sadly :(
  • Euler or Gauss for the on-install abilities
• Utility programs:
  • Self-modifying Code: Dig for Hush when you really need it. Pricey, but combined with your ability you can threaten the mid-run install of any program from an empty board.
  • Laser Pointer as D4v1d-Gr43b3r points out is a great 1-off bypass for dangerous ice
  • Cordyceps: One go could be enough to move taxing ice off R&D
  • Nga or Imp: You only get one use out of these, which is probably not worth it
  • Nyashia for surprise multi-access

Make sure you have a full grip and keep the corp in fear of your mid-run installs!

A "green Botulus" - this is an awesome card for early game pressure. Unlike Botulus, you can slap vandal multiple times in one turn, and it's immune to purging. Of course, the downside is that vandal costs real money to use, but at least it's cheaper to install!

Beware Týr!