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Magic: The Gathering Comprehensive Rules Changes

Planar Chaos to Future Sight (Single Change View)

General changes

Old rule (Planar Chaos) New rule (Future Sight)

424.4.

What a player actually needs to do to pay a cost may be changed or reduced by effects. If the mana component of a cost is reduced to nothing by cost reduction effects, it is considered to be {0}. Paying a cost altered by an effect counts as paying the original cost.

Example: You play a spell with mana cost {W} that has kicker {1}. You choose to pay the kicker, but a cost reduction effect means you spend only {W} when paying for the spell. The spell's "if the kicker cost was paid" effect will be applied.