The Walls of Ba Sing Se [Avatar: The Last Airbender] Infinity Stone Set: Betrayers of Kamigawa Type:

Set: Betrayers of Kamigawa Type: Instant — Arcane Rarity: Rare Cost: {X}{U}{U} You may exile a blue card with mana value X from your hand rather than pay this spell's mana cost

Put one pile into your hand and the other into your graveyard

enter the first room or advance to the next room

Each creature card in your hand has ninjutsu {2}{U}{B}

“Since the last sliver arrived

The Walls of Ba Sing Se [Avatar: The Last Airbender] Infinity Stone Set: Betrayers of Kamigawa Type:Set: Avatar: The Last Airbender Type: Legendary Artifact Creature Wall Rarity: Mythic Cost: {8} Defender Other permanents you control have indestructible. "That is why the city is named Ba Sing Se. It's the 'impenetrable city.'" General Sung