Pair o' Dice Lost

If Pair o' Dice Lost resolves, it will be exiled, even if you don't return any cards to your hand.

Each die is identified by the number of faces it has. A six-sided die is a die with six equally likely outcomes: 1, 2, 3, 4, 5, and 6. The roll must be fair. Although physical dice are recommended, digital substitutes are allowed except in cases where the physical die is required for the effect.

If an ability triggers "whenever you roll a die," it will trigger whenever you roll any die, including the planar die. This is a change from previous Un- rules. Some abilities use the result to determine part of the effect. If you get a non-numerical result (currently just the planar die, but the future is long), that part of the effect won't do anything.

You can return any number of cards with mana value 0 (such as land cards) from your graveyard to your hand regardless of the results.

Pair o' Dice Lost doesn't target any of the cards in the graveyard. You choose which cards you're returning to your hand, if any, after rolling the dice.

If a die is rerolled, the original roll essentially never happened: it doesn't cause any abilities to trigger, and no effect that cares about die rolls will consider it.