Sphere of Resistance + Myr Superion

[k2thej]

If there is a Sphere of Resistance out and I want to cast Myr Superion does the additional mana also need to be from creatures?

[Koby]

Yes.

[cdr]

Mana payment restrictions for spells apply to the total mana cost: mana cost - reductions + additions + Trinisphere = total mana cost.