Nahiri, the Harbinger [Shadows over Innistrad Prerelease Promos] Unlimited Edition Return Thawing Glaciers to its

Return Thawing Glaciers to its owner's hand at the beginning of the next cleanup step

then sacrifices all creatures they control

Set: Seventh Edition Type: Land Rarity: Rare Whenever City of Brass becomes tapped

When Tiamat enters the battlefield

If each of those creatures could block all creatures that the other is blocking

Nahiri, the Harbinger [Shadows over Innistrad Prerelease Promos] Unlimited Edition Return Thawing Glaciers to itsSet: Shadows over Innistrad Prerelease Promos Type: Legendary Planeswalker Nahiri Rarity: Mythic Cost: {2}{R}{W} +2: You may discard a card. If you do, draw a card. 2: Exile target enchantment, tapped artifact, or tapped creature. 8: Search your library for an artifact or creature card, put it onto the battlefield, then shuffle. It gains haste. Return it to your hand at the beginning of the next end step.