[bug, csc] Common Cold passive does not trigger properly

Just to avoid the weirdness on the card, we could just give it a normal dizzy cost. It means (due to timing) that it'd Poison all monsters after giving Poison+1 to the targeted monster (so targeting an unpoisoned monster would set it to 1 Poison counter rather than 2), but it'll probably still be fine.

EDIT: Or (though this is a slight nerf), just give it " All opponent's monsters are Poisoned, target monster gains Poison+1", and remove the dizzy trigger.