Force Spike
Instant
Counter target spell unless its controller pays 
.
Illustrated by
Friday Night Magic 2007#12RareEnglishLegality
Rulings
Oct 4, 2004
The payment is optional.
CascadeFriday Night Magic 2007#12RareEnglishCascadeInstant
Counter target spell unless its controller pays .
Illustrated by
Friday Night Magic 2007#12RareEnglishThe payment is optional.