alliances

If Balduvian Trading Post would enter the battlefield, sacrifice an untapped Mountain instead. If you do, put Balduvian Trading Post onto the battl...

If Heart of Yavimaya would enter the battlefield, sacrifice a Forest instead. If you do, put Heart of Yavimaya onto the battlefield. If you don't, ...

If Kjeldoran Outpost would enter the battlefield, sacrifice a Plains instead. If you do, put Kjeldoran Outpost onto the battlefield. If you don't, ...

If Lake of the Dead would enter the battlefield, sacrifice a Swamp instead. If you do, put Lake of the Dead onto the battlefield. If you don't, put...

{T}: Add {C}. {2}, {T}: Add one mana of any color.

If Sheltered Valley would enter the battlefield, instead sacrifice each other permanent named Sheltered Valley you control, then put Sheltered Vall...

If Soldevi Excavations would enter the battlefield, sacrifice an untapped Island instead. If you do, put Soldevi Excavations onto the battlefield. ...

Thawing Glaciers enters the battlefield tapped. {1}, {T}: Search your library for a basic land card, put that card onto the battlefield tapped, the...