What it does
"For Auld Lang Syne" isn't an official Magic keyword—it's not a real ability that appears on any card. It sounds like a flavorful name (a nod to the New Year's song about remembering old times), so it may be a custom card mechanic, a joke, or a fan-made design you've encountered outside official Wizards products.
If you saw this on a card, double-check the source. It could be from an unofficial set, a playtest card, or a homebrew Commander deck. Custom mechanics like this only work if everyone at your table agrees to them, since they aren't supported by the comprehensive rules or Oracle text.
If you can share the full card text or where you found it, I can help interpret how it's meant to function and how it'd interact in a Commander game.
