KalCek, Overshadowed

Flying, Haste
When KalCek attacks, it gets +1/+1 until
end of turn for each attacking creature with
power higher than its own. When KalCek dies,
exile it until the beginning of the next end step,
then return it to the battlefield under its owners
control tapped with an extra exile counter.
Pay {x}{x}; deal 3 damage to any target where {x} is the amount of exile counters.
You cannot use this ability if it has no exile
counters