Land - Plains Swamp Color tag templates(None) Marsh Flats , Pay 1 life, Sacrifice this land: Search your library for a Plains or Swamp card, put it onto the battlefield, then shuffle
If you cast this spell on turn three you can easily catapult yourself up to six or seven mana, letting you cast practically whatever spell you want.
In particular: Griselbrand easily finds you free counterspells like Force of Will and Daze, which you can use to protect him or stop your opponent's gameplan
The activated ability may be a somewhat difficult cost, but with cards like Timeless Lotus and Mobile Garrison, imagine how many additional combat phases you can get
Gaining protection from everything can buy the player an extra turn, preventing all damage while also deflecting any spells or abilities that target players, from Thoughtsize to Lightning Bolt