Godsend
The Godsend is the swordspear that is wielded by Elspeth Tirel on Theros.
Once upon a time, when the God Purphoros raised arms against Heliod, he crafted the Sword of Chaos which was capable of damaging the substance of Nyx. When Heliod and Purphoros clashed, it damaged the celestial resting place of Polukranos, World Eater and the hydra fell to Theros where it was sealed by Nylea and Heliod under Nessian forest.
At the moment of the clash, Elspeth just had planeswalked to Theros for the first time. She saw the Sword of Chaos falling from the sky, grasped it and planeswalked away. When she returns to Theros, ten years later, Heliod is angry at her at first. But when the God realises she might be the Champion of the Sun reborn he reforges the sword it into the Godsend. Elspeth uses her new weapon to defeat the awakened Polukranos.