Then each creature that isn't an Insect, Rat, Spider, or Squirrel gets -1/-1 until end of turn for each creature you control that's an Insect, Rat, Spider, or Squirrel
In short, as many as your cards allow you to
I do think its worth a shot elsewhere, though, as it can cheat big creatures into play
Marvel Super Heroes continues the Marvel Universe bonus sheet (MAR) with 60 new entries
the card is just too bad in the fair games where it is hard to spend a whole card just to bounce an opposing spell back to hand for a bit
We arent given percentages, so Im running with the idea that all are equal and with 163 options, over two slots, youve got a 1/81.5 of getting the specific EA you want