While she lacks an ultimate, you can -1 her to make a 4/4 green Rhino Warrior dork and that can block attacks on her and swing
For a single Blue, you can counter an instant, sorcery or enchantment
The Sapphire/Steel deck seems faster and more aggressive for grabbing lore, while the Amber/Amethyst deck may require a bit more strategizing and time in order to win
Y'shtola, Night's Blessed: Well versed in arcane and ancient wisdom, Y'shtola's pragmatism is matched only by her thirst for knowledge
Ramp into Gishath as fast as possible, give him haste or trample, and swing
Green and white are, by far, the best colors for cards with the same or similar effects