Alms

Players may not rearrange the cards in their graveyards. This is a little-known rule because new cards that care about graveyard order haven’t been printed in years.

The last thing that happens to a resolving instant or sorcery spell is that it’s put into its owner’s graveyard. —Example: You cast Wrath of God. All creatures on the battlefield are destroyed. You arrange all the cards put into your graveyard this way in any order you want. The other players in the game do the same to the cards that are put into their graveyards. Then you put Wrath of God into your graveyard, on top of the other cards.

The “top” card of your graveyard is the card that was put there most recently.