Block Constructed is the smallest of the three constructed formats. It's devoted to cards solely in a single block of expansions. A block of expansions is defined by Wizards of the Coast with the sets being themed together and sharing mechanics, themes, story and other elements which make them work especially well together.

The current Block Constructed Format is:

• Zendikar
• Worldwake
• Rise of the Eldrazi

On October 1st, the Block Format rotates to:

• Scars of Mirrodin