From here, Bolas will presumably play a key role in Tarkir: Dragonstorm
This makes the creatures Nahiri, the Harbinger fetches incredibly consistent, but the set-up required doesnt bring Nahiri very far up the ladder
First, the Forest cards it fetches come in untapped (barring other clauses), which means you can use that mana immediately effectively reducing its net cost to 2 mana during the turn you play while ramping you by 2 lands for the rest of the game
Im not entirely sure what it does as its reminder text sounds like a drunk hobo got his hands on a Magic rulebook, but its cool nonetheless
We could also still go for the turn one Timetwister play, but this would depend on how many turn one permanents our opponent has landed
Other examples of cards that can do that are Disallow and Tale's End