The Walls of Ba Sing Se

Kicker 2 (You may pay an additional 2 as you cast this spell.) Search your library for a basic land card. If this spell was kicked, instead search your library for a basic land card and a Shrine card. Reveal those cards, put them into your hand, then shuffle. You gain 2 life.

Lands you control gain all basic land types until end of turn. Draw a card.

Exile target artifact, creature, or enchantment. Its controller creates a Clue token. (It's an artifact with "2, Sacrifice this token: Draw a card.")

Flying When Aang enters, airbend up to one other target nonland permanent. (Exile it. While it's exiled, its owner may cast it for 2 rather than its mana cost.) Whenever you cast a Lesson spell, Aang gains lifelink until end of turn.

Flash When this enchantment enters, exile up to one other target nonland permanent until this enchantment leaves the battlefield. Waterbend 3: Sacrifice this enchantment. If you do, scry 2. (While paying a waterbend cost, you can tap your artifacts and creatures to help. Each one pays for 1.)

When this enchantment enters, airbend up to one target creature. Whenever a creature you control enters, put a quest counter on this enchantment. At the beginning of your end step, if this enchantment has four or more quest counters on it, exile up to one target creature you control, then return it to the battlefield under its owner's control.

Choose one — • Destroy target attacking creature. • Airbend target creature you control. (Exile it. While it's exiled, its owner may cast it for 2 rather than its mana cost.)

Airbend target nonland permanent. (Exile it. While it's exiled, its owner may cast it for 2 rather than its mana cost.) Draw a card.