Urk.

I have no idea what colourless should be able to do. This feels "Ridiculous! Desert Twister was silly enough; but colourless?" Only then, I think about it a bit - and there's plenty of precedent. Unstable Obelisk and Universal Solvent both say it costs ; though Spine of Ish Sah is absolutely bonkers and is repeatable. So non-repeatable and double in cost for a total cost reduction of is probably fine.

So wow. Good hit. Vindicate does indeed fit in colourless at this kind of cost; and certainly thematically fits, what with 'Annihilate'.

The official generic mana cost for this kind effect is , as in Scour from Existence.

­ can get you a discount. This is fine.