Sluggish Snailification

Creatures with creature type "Slug" or "Snail"
now are both of these creature types.
Each Slug gets +1/+0 and each Snail gets +0/+1.
Slugs and Snails now have "Semi-Poisonous:
For each two Slugs and/or Snails that deal
combat damage to a player, that player gets
one poison counter."
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"Are those creatures snails or slugs?"
- famous last words