Effect
Declare a Level between 1 and 12; each player tosses a coin, and if both are Heads, the Levels of all face-up monsters you currently control become the declared Level. If both are tails, you lose Life Points equal to the declared Level x 500.
You cannot activate "Big Jackpot!?" during the Damage Step.
If both players toss a coin as part of the effect resolution of "Big Jackpot!?", and the results are different (one heads, one tails), nothing happens, and the resolution of "Big Jackpot!?" ends.
The part of the effect of "Big Jackpot!?" that states "you lose LP equal to the declared Level × 500" is not treated as effect damage.
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