The deck of cards we used was a modified version of the IoT Tiles toolkit. For more details on the cards and other work by the same group see Tiles IoT Toolkit.
IoT Service Kit is an open IoT-based board game (PDF and 3D printable pieces) that can be used to brainstorm IoT solutions for specific environments.
Much like the Tiles cards, Thingclash provides an IoT themed workshop activity. Unlike Tiles though, Thingclash is intended to help people understand potential unforeseen and negative consequences of IoT.