Brainfreeze Elixir

Potion: Discard your hand. (If this potion enters the battlefield without its potion cost being paid, sacrifice it as it enters the battlefield.)

Brainfreeze Elixir comes into play with X potion counters on it, with X being the number of cards discarded as part of Brainfreeze Elixir's casting cost plus one.
{t}, Sacrifice Brainfreeze Elixir: target opponent skips his next X draw steps.