Because I Have Willed It

The second ability only checks that four or more spells were cast. It doesn’t matter if those spells are countered or fail to resolve for other reasons.

Effects that reduce the generic mana cost of a spell can’t reduce that spell’s colored mana requirements.

If an instant or sorcery spell has {X} in its mana cost, choose the value for X first, then reduce the cost by {1}. For example, Volcanic Geyser with X chosen as 4 costs {3}{R}{R} to cast if this scheme is face up.