Sphere of resistance compared with Trinisphere

[agesga]

How does behave the force of will under an environment with
a) Trinisphere
b) Sphere of resistance
if the optional cost of fow (-1 life and RFG 1 blue card) is decided to be payed.
I think that under Trinisphere an additional 3 mana must be payed, but not sure about the sphere.
Thanks

[Ambitious]

How does behave the force of will under an environment with
a) Trinisphere
b) Sphere of resistance
if the optional cost of fow (-1 life and RFG 1 blue card) is decided to be payed.
I think that under Trinisphere an additional 3 mana must be payed, but not sure about the sphere.
Thanks

Both will increase the cost of Force of Will, Sphere of resistance will increase it by one and trinisphere will increase it to three.  This is because Force of Will says "instead of paying Force of Will's mana cost", but cost increases like either sphere are not part of the mana cost.

[LotusHead]

It goes:

Cost Increases (Sphere of Resistance)
Cost Decreases (Affinity, Goblin Warchief)
Check for Trinisphere (everything costs at least 3.)

[agesga]

As i have thought. I remebered the rule of cost modificacion from magic saturday school. The problem is when playing with MWS. There are some players who are very sure about their knowledge of Magic Rules. They never have even a little doubt.
Anyway thanks.

[Clariax]

As i have thought. I remebered the rule of cost modificacion from magic saturday school. The problem is when playing with MWS. There are some players who are very sure about their knowledge of Magic Rules. They never have even a little doubt.
Anyway thanks.

This is why tournaments have judges.  If it's not a tournament, you can explain it to your opponent, but there's not much you can do if they won't listen, other than to find someone else to play.