Yes, Shiny Spell!

(Yes, Shiny Spell! has a converted manacost of 1,
but nice try.)
Pay2Win - instead of paying Yes, Shiny Spell!'s manacost, wait for someone to cast a spell,
exclaim Yes, shiny (spell name) The spell must be printed on a foil card.
Counter target spell named when Yes, Shiny
Spell! was cast.