What is Pioneer?
Pioneer—a new nonrotating format featuring cards from Return to Ravnica and forward
Pioneer is a constructed format and therefore adheres to the following constructed rules:
- Minimum of sixty cards
- No maximum deck size, as long as you can shuffle your deck unassisted
- Up to fifteen cards in your sideboard, if used
With the exception of basic lands (Plains, Island, Swamp, Mountain, Forest, and Wastes), your combined deck and sideboard may not contain more than four of any individual card, counted by its English card title equivalent.
All Standard releases from Return to Ravnica forward are legal
The following card sets are permitted in Pioneer