* Discard costs: Some cards require you to discard cards from your hand to activate their effects. These cards can be used to thin out your deck or get rid of unwanted cards.
* Graveyard effects: Some monsters and spells have effects that activate when they are in the Graveyard. These effects can be used to draw cards, search your deck for cards, or even inflict damage to your opponent.
* Tributes: Some monsters require you to tribute (sacrifice) other monsters on your field in order to summon them. These monsters can be used to bring out powerful monsters that would otherwise be difficult to summon.
* Hand traps: Hand traps are cards that can be activated from your hand to disrupt your opponent's plays. These cards can be used to negate your opponent's effects, destroy their cards, or even prevent them from summoning monsters.
Here are some specific examples of cards that work in the graveyard:
* Revive monsters:
* "Monster Reborn"
* "Call of the Haunted"
* "Soul Charge"
* Discard costs:
* "Pot of Desires"
* "Allure of Darkness"
* "Dark World Dealings"
* Graveyard effects:
* "Mezuki"
* "Plaguespreader Zombie"
* "D.D. Crow"
* Tributes:
* "Monarch" monsters
* "Blue-Eyes White Dragon"
* "Red-Eyes Black Dragon"
* Hand traps:
* "Ash Blossom & Joyous Spring"
* "Droll & Lock Bird"
* "Effect Veiler"