"Natural Dice" and sacrificial dagger

[Auere]

It says in the rulebook that a spell fails no matter what, if the wizard rolls below 3 on the "natural" casting dices?

That obviously means that you would have to throw MINIMUM two dices at each spellcasting attempt in order to successfully avoid a spellcasting failure that would end the phase for the caster.

So if the dices generated from the sacrificial dagger count as "extra dices" rather than "natural dices", what is the point of taking sacrificial dagger - at least with a level 4? You will be throwing 2 dices at all spellcasting attempts anyway (save perhaps the last) - which will nearly always be enough to beat the minimum casting with a +4 modifier from the supreme sorceress.

If you continually want to gamble with augmented spells, then perhaps it has its uses, but at least with the dark magic lore, sacrificial dagger doesnt really make sence...

[Starphoenix]

Natural Dice refers to dice rolled without modifiers (sorc Lvl, tzeentch, VC Powers, etc).

The extra die rolled by the SD is a natural die, once rolled.