He might face backlash from his own side. His family or the other Death Eaters, if it's set in that kind of context, could view his act as betrayal. They would likely be angry with him and might try to punish him in some way.
One possible reason could be a moment of sudden realization. Maybe Draco realizes that Harry is in a dire situation where he needs the wand to defend against a common enemy. It could be a sign of a shift in Draco's character, from being an antagonist to having a moment of altruism.
Perhaps Draco has developed a sense of respect for Harry over time. He might have seen Harry's courage and determination up close and decided that Harry is worthy of his help. Throwing the wand could be his way of showing that he acknowledges Harry's importance in the fight against the common enemy.
In some fanfictions, Draco Malfoy might obtain the Elder Wand by chance. This could lead to a whole new set of adventures. Maybe he uses it to protect his family or to rewrite his own story within the wizarding world. It often depends on the creativity of the fanfiction writer.
Well, he might start to show off his wand skills immediately. Maybe he'd use it to perform some spells he's been eager to try, like a new levitation charm or a tricky transfiguration spell just for the fun of it.
One possible fanfic could be about how Harry discovers new and unexpected powers of his wand. Maybe it starts with him accidentally using the wand in a way he never has before during a simple spell - like making a flower bloom in an extraordinary way that defies normal magic. This could lead to a journey of exploration as he tries to understand the true potential of his wand, perhaps with the help of Hermione and Ron.
Perhaps it was related to some new and untamed magical ability within Harry. For example, if he discovered a hidden power within himself that was too much for his wand to handle. His wand, which was made for normal magical use, couldn't withstand the intensity of this new power, and thus shattered.
He might have lost his main means of casting spells. This would put him at a great disadvantage in any magical battles or challenges. Without his wand, he would have to rely on other forms of magic or his natural abilities, which could be much more difficult.
He might choose a phoenix feather because it represents rebirth and magic. And for the wood, perhaps he'd pick holly, which is often associated with protection in the wizarding world.
In Harry Potter and the Deathly Hallows, Dumbledore, not Malfoy, was the real owner of the Elder Wand. However, when Dumbledore was injured by Dark Magic and needed a new wand, Malfoy tried to take the Elder Wand but was stopped by Dumbledore and his friends.
Although Malfoy didn't really own it, he showed a sense of greed and jealousy when Dumbledore needed a new wand. He had tried to get the Elder Wand through deception and threats, and had succeeded. However, this also caused the relationship between the Elder Wand and Dumbledore to become even more tense. Dumbledore and his friends finally succeeded in destroying Malfoy's Elder Wand and protecting its true owner.