White has a theme of drawing cards whenever a small creature enters, so cards like Welcoming Vampire, Mentor of the Meek, and Tocasia's Welcome are huge additions to token decks
Kaalia lets her controller cheat on mana and get those creatures into play as early as Turn 4 (without ramp and with a Haste provider, like Lightning Greaves) and even sooner with mana acceleration, like Sol Ring
Giant Growths are obviously the best and I would always play 4 of these
Cover of Darkness is probably the most important card in this deck, granting fear to your entire board but for cheaper than Marrow-Gnawer, and on an enchantment
Dryad of the Ilysian Grove is a strong second since it fixes your mana and makes it easy to activate Sisays ability
Playing lands off the top of your library allows you to skip past dead draws and hopefully get answers more quickly