immovable
Twice I have cast Ghalta, the Immovable for single green but did not get the achievement in the Way of the Theorist but did get it under something worth saving the 1st time.
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Obsidian#14616
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Rezzahan#77802
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If it was for 1 green mana, you have cast Ghalta the Unstoppable, not Ghalta the Immovable. That one needs white, and is the one needed for the achievement.