Heroic Intervention is one of the best green instants in MTG because it protects everything at once, from your lands and creatures to enchantments
Notice that sacrificing the Clue is part of the activation cost
It's taken me a while to realize it, but I would rather be completely mana screwed and lose, than win by stomping a table to the ground (unless that's what everybody signed up for)
Pausing to take the scene in, and possibly being reminded of her failings in saving her brother Josu, Liliana then turned the Dreadhorde on Nicol Bolas, stopping their attack on Gideon (but not before one harvested Dack Fayden's spark)
II Create a 0/4 colorless Wall artifact creature token with defender
As long as Ozai, the Phoenix King is on the battlefield, you'll keep unspent mana as steps and phases end (although it will become red)