Is there a card that has an ability to the effect of "Choose a creature type. Creatures of that type cannot be summoned."? I feel like I would have found something on it if there was, seeing as it counters A LOT of decks, but I'd like to get confirmation.
That specific effect does not exist. However, there are some cards with effects that are probably less powerful, but still can do significant damage to a tribal deck:
- An-Zerrin Ruins prevents creatures of a chosen type from untapping.
- Circle of Solace allows you to prevent damage from creatures of a chosen type.
- Engineered Plague decreases the power and toughness of creatures of a chosen type. Outbreak has a similar effect, but just for one turn.
- Tsabo's Decree destroys creatures of a chosen type, and also makes your opponent discard creature cards of that type.
No, there is no card that prevents creature types from being played. The closest card (prevention wise) would be Iona, Shield of Emeria, which prevents your opponents from playing a color. This would do quite a bit of damage to a tribal deck, since most tribes favor a color (goblins are red, merfolk are blue, elves are green etc)