Historical Rules · 27 February 2026
Rule 609.4b
Official source text from the 27 February 2026 Rules release
If an effect allows a player to spend mana “as though it were mana of any [type or color],” this affects only how the player may pay a cost. It doesn’t change that cost, and it doesn’t change what mana was actually spent to pay that cost. The same is true for effects that say “mana of any type can be spent.”