Adding Monsters to Combat Against Yourself

[Ghost_Nappa]

That answers half of my question. I can't find a picture of the individual monster or it's effect. I don't know if his effect is supposed to activate before combat - in which case he cheated because of this:

Q. One of my opponents adding a Wandering Monster that has a "before combat" effect (e.g., the Tongue Demon makes you discard an Item before combat). Since I'm already in combat, do I still have to do it?
A. No. You lucked out this time. (We reeeeeeally wanted to say yes, because we're munchkins, too, but that leads to timing issues.)

I've been trying to find a picture of the monster (Toxic Mold? Abomination?) but I can't find anything helpful.