Disseminating Zealots

When Disseminating Zealots enters, search
your library for a basic plains card, reveal it,
and put it into your hand, then shuffle.
Disseminating Zealots and other white spells
you cast have: "Adamant — If at least three
white mana was spent to cast this spell, look at
the top card of your library. If it's white, you
may play it this turn."