Chancellor of the spire question

[Jdogtoocool]

If I play {chancellor of the spires} and I choose a card that I can tap multiple mana on like say a {bonfire of the damned} from my opponents graveyard can I pump it up myself or does its effect work differently?

[Poof]

Ruling says u may pay additional costs such as kicker costs so I'd say u can pay whatever u want for x

[Poof]

I take that back now after reading omniscience rulings it says if u cast a card without paying it's mana cost and x is part of the cost x must be 0. 

[scarsabrex]

I take that back now after reading omniscience rulings it says if u cast a card without paying it's mana cost and x is part of the cost x must be 0.

correct

[Wackaman9001]

I take that back now after reading omniscience rulings it says if u cast a card without paying it's mana cost and x is part of the cost x must be 0.

This 🔨

[Jdogtoocool]

Thanks I understand how the x in the casting cost affects the card, yup x equals bad