Drawing a card whenever you cast a spell with mana value 5 or greater is excellent with sweepers like pre-rotation Sunfall, where you can kill every creature and draw a card, with removal spells like Leyline Binding, or with the various Overlords that can enter the battlefield for cheap via impeding, like Overlord of the Hauntwoods
Its like receiving four drink tickets for an event and only using two
That third ability, making all creatures lose their abilities, might have some pretty interesting uses too
Azorius Sleeves: White Blue Mana - Realm Guard MTG Sleeves - 100 ct Azorious Card Sleeves for MTG with White and Blue Mana Symbols are perfect for competitive control players or "casual" control fans
While this has been popular it has under performed
Commander players know that using ETB effects is always good in any color, and in white mana, it doesn't get any better than Elesh Norn, Mother of Machines.