Rowan, Scholar of Sparks // Will, Scholar of Frost

Neither face’s first ability can reduce colored mana requirements of spells you cast.

For Will’s first loyalty ability, any effects that modify a creature’s power and/or toughness without setting them to a specific value (i.e. ones that don’t affect base power and/or toughness) will apply after its base power and toughness are set, regardless of the order those effects were created. The same is true for counters that modify its power and toughness.

For Rowan’s emblem, you can pay {2} only once. You can’t pay more to copy the spell more than once.