mtg card reviews Is Proxy King legit? Proxy Review ProxyKing.biz and PrintMTG.com Review and

If your opponent discards a card while you control Leyline of the Void, abilities that check whether a card is discarded (such as Hollow One, or a madness ability of the discarded card) still work, even though that card never reaches that player's graveyard

White decks have specific reasons to incorporate alternative draw effects as well

It doesnt have to target a creature you control, so you can use this as a combat trick before blockers are declared on one of your opponents creatures too

Theyre cheap and/or affect the battlefield with evasion

These are all great tutors in their own right, especially Worldly and Mystical, which put cards right on top of your deck