Modern, Legacy, Pioneer, & vintage are constructed formats 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
• Banned Cards may not be included in your deck, restricted cards may only have one copy in your deck.

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.

Commander is a 100 card singleton constructed format and therefore adheres to the following rules:

• One Commander(a legendary creature OR permanent that can be a commander)or two partner  commanders)
• Exactly 99 cards in library, of of which are within your commander's color identity
• full details HERE
• Banned Cards may not be included in your deck

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.