Isildur's Fateful Strike [LTR]

Isildur's Fateful Strike

Legendary Instant

(You may cast a legendary instant only if you control a legendary creature or planeswalker.)Destroy target creature. If its controller has more than four cards in hand, they exile cards from their hand equal to the difference.

Isildur cut the Ring from Sauron's hand with the hilt-shard of his father's sword, and Sauron himself was overthrown.