There are a ton of ways to have creatures enter the battlefield without casting them, and when combined with token doublers, you can trigger enter the battlefield triggers a ton of extra times
Enchantment Color tag templates(None) Ghostly Prison Creatures can't attack you unless their controller pays for each creature they control that's attacking you
Claim your fate and expand your collection with the Shining Fates expansion
Whites got a lot of resources in almost all archetypes, ranging from artifact support, good value midrange cards, and even good wraths, not to mention the solid reprints
Think along the lines of Niko, Light of Hope, Adrix and Nev, Twincasters, and such
Pro tip: if youre just starting out, pick up a pre-built deck