When you draw this card, it adds a random Snail in your hand. But if you play it when you have 2+ ally Snails, it will add a Thundersnail to your hand instead.
Thundersnail is a 3G spell that will summon all dead ally Snails and will trigger their Magic. This can be useful to make a chain reaction of buffs. You will also get a Napstablook in your hand.
- Thundersnail summons all dead ally snails, and not just random 4. This means, if your opponent has a Big Mouth or a Heats Flamesman, Thundersnail can lead to huge chain reactions.
- Snail Trainer is the only card that can make you overdraw while using Trash Tornado.
- Snail Trainer is one of the two cards with non-canon sprites, the other being Bob.