It plays best in a low-curve deck with lots of small legends like Tymna the Weaver or payoffs like General's Enforcer, building up a strong battlefield presence turn after turn
This means that any creatures you equip with aura cards, bits of equipment or those you put counters on count as modified
Because of this, and the comedy value that comes from running such an absurd vanilla creature, Yargle and Multani is actually fairly popular in Commander
Seeing as this was the first card ever to be printed with the Book subtype, one could speculate that every future Book card will share an effect in common with Diary of Dreams
Shes back for another go, and still cares about the top card of the deck
Its simplicity makes it the best MTG deck for beginners who want to jump right into the game without being overwhelmed by complex mechanics