Team mill deck (yugioh)?

Question

ok i have a question for yugioh in the team format. needle worms text says "Flip: discard five cards from the top of your opponent's deck to their graveyard". My question is would this card effect the turn player, a chosen opponent, or would the card work like morphing jar, and effect both opponents?

Answer 1

it works on all duelists!! ;-)

Answer 2

It will work on one player. The only time a card works on both opponents is if it affects "both players" or "each player", then it affects everyone. However if you play by upper deck entertainment team rules, a card like "Lightning Vortex" that affects the opponent's FIELD affects both opponent's field, because the field is combined. Decks aren't, so, in summary, you choose an opponent to apply the needle worm's effect to.