Noble Benefactor

When this creature dies, each player may search their library for a card and put that card into their hand. Then each player who searched their library this way shuffles.

The List

Weatherlight

If Noble Benefactor is put into any graveyard from play, each player may search his or her library for any one card and put that card into his or her hand. Each player who searches his or her library shuffles it afterwards.

The player whose turn it is searches their library (or chooses not to), then each other player in turn order does the same. Then the player whose turn it is shuffles their library (if that player searched), then each other player in turn order does the same.