Yoshihiko put me on to the Crack-Chromatic interaction, which Oath of Nissa brings to more reasonable levels of consistency
additionally, one of her abilities triggers when you do so, as Ursula allows you to exert a chosen character any time she Quests
Read More: The 10 Worst Cards In MTG 3 Westvale Abbey Profane Prince This is sort of a land
Sylvan Library is not a million miles off Land Tax, both are above the curve but not being threats they get away with it rather more
Other times, you can (attempt) to protect it
I also haven't done this for any other deck, but if you're willing to dish out a few extra bucks I highly recommend picking up Calamity of the Titans, Desecrate Reality, and Not of This World, they're all under $5 each but they are incredible for the deck