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|Spells, Abilities, and Effects|
The graveyard is one of the six main zones in the game of Magic: The Gathering. It is the pile into which you discard, where instant and sorcery spells go once they have resolved, and where permanents go when they have been sacrificed, destroyed, or "put into the graveyard" due to a state-based effect.   
Cards in the graveyard are usually no longer relevant to the game, but some mechanics do interact with the graveyard. Examples are Flashback, unearth, dredge and delve. A notable creature type that often comes back from the graveyard is Zombies. The threshold mechanic also makes use of the graveyard and the number of cards in it. Decks such as reanimator are built to use or re-use cards in the graveyard, often making it as useful a resource as a player's hand.
Weatherlight was the first set where the graveyard "mattered". Blocks like Odyssey and Innistrad gave graveyard Strategied the center stage, and the graveyard played a huge part for the Golgari, Grixis, and Sultai in otherwise not-graveyard-focused sets. 
Order of cards in the graveyard
Several cards relied on the order of cards in a graveyard (i.e. Ashen Ghoul), "Volrath's Shapeshifter from Stronghold was the last card printed that referred to the graveyard being in a specific order".
- Mark Rosewater. (November 14, 2011.) "Grave Consequences, Part 1", Daily MTG, magicthegathering.com, Wizards of the Coast.
- Mark Rosewater. (November 21, 2011.) "Grave Consequences, Part 2", Daily MTG, magicthegathering.com, Wizards of the Coast.
- Tom LaPille. (November 18, 2011.) "Graveyard Shifts", Daily MTG, magicthegathering.com, Wizards of the Coast.
- Sam Stoddard. (February 6, 2015.) "Sultai Graveyard Strategies", Daily MTG, magicthegathering.com, Wizards of the Coast.
- Wizards of the Coast. (May 16, 2002.) "Graveyard Order", Daily MTG, magicthegathering.com, Wizards of the Coast.