Each Player reveals 1 card from their hand. If one card is higher Level than the other, the card with the lower Level is sent to the Graveyard, and the player who revealed it takes 1000 damage. (Non-Monster Cards are treated as Level 0.)
Rulings
Individual Card FAQs
If "Ante" is the only card in your hand, you cannot activate it.
If your opponent has no cards in his hand, you cannot activate "Ante".
You select cards at the resolution of "Ante"'s effect, not at "Ante"'s activation.
You cannot chain "Barrel Behind the Door" to "Ante" because you don't know for certain whether you will take damage.
If either player chains "Raigeki Break" or "Last Turn" to "Ante" and then has no cards at resolution of "Ante"'s effect, "Ante"'s effect disappears.
When "A Legendary Ocean" is active and you activate "Ante", when you check the Level, treat the Levels of WATER monsters in the hand as 1 lower for purposes of "Ante".
Netrep Rulings
If โCost Downโ has successfully resolved before โAnteโ resolves, the monster chosen by the player who activated โCost Downโ is reduced by 2 Level Stars as per the effect of โCost Down.โ