mtg card singles Magic the Gathering

Whenever a creature attacks you or a planeswalker you control, investigate.

There are two Rise of the Floodborn starter decks in total (Amethyst & Steel and Amber & Sapphire), but they all include a pre-balanced and ready-to-play deck consisting of 60 cards using two "ink" types

Combat Strategy Theme: Riders of Rohan deck focuses on coordinated attacks and combat interactions

For a more in-depth review of the history of Commander, check out this article by Charlie Hall on Polygon. A key component of the Commander Philosophy document was the inclusion of Rule 0, an initial rule inviting players to modify the rules to maximize the enjoyment for everyone playing