Zaborg the Mega Monarch (NECH-EN037) [The New Challengers]

You can Tribute Summon this card by Tributing 1 Tribute Summoned monster. When this card is Tribute Summoned: Target 1 monster on the field; destroy that target, then if it was a LIGHT monster, both players send as many cards from their Extra Deck to the Graveyard as possible, but not more than the destroyed monster's original Level or Rank. If this card was Tribute Summoned by Tributing a LIGHT monster, add this additional effect.
? You choose the cards to be sent to the Graveyard from your opponent's Extra Deck.