Boseiju, Who Shelters All

Legendary Land

Boseiju enters tapped. , Pay 2 life: Add . If that mana is spent on an instant or sorcery spell, that spell can't be countered.

Legalities

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Rulings (2)

2004-12-01 Suppose mana produced by Boseiju is spent on a spell and an effect creates a copy of that spell. The copy can be countered, even though the original can't.
2004-12-01 The spell can't be countered if the mana produced by Boseiju is spent to cover any cost of the spell, even an additional cost such as a splice cost. This is true even if you pay an additional cost while casting a spell "without paying its mana cost."