It can also be useful to fill the Graveyard with monsters in order to revive all of them at once with "Soul Charge".
While "Painful Choice" does not actually discard, this can be of use in a Dark World Deck. You can use this card to reveal 3 copies of "Grapha, Dragon Lord of Dark World" and 2 other important cards. No matter which card your opponent picks, you will have two copies of "Grapha" in your Graveyard. After Normal Summoning a weaker "Dark World" monster, you can return it to the hand to Special Summon a copy of "Grapha".
This card can also be used to send monsters to the Graveyard in order to set up the Summon of monsters that are typically difficult to Summon, such as "Dark Armed Dragon", "Dark Necrofear", and "Exodia Necross", without taking more time to set up your Graveyard and risk those cards being removed by "Soul Release" before you can Summon your intended monsters.