In Team Play, when an attack like Kakuna's "Secrete Poison" or "Agility" specifies the phrase "during your opponent's next turn", does that count for both opponents or do you have to choose one of the opponents to have the effect during their turn only?
You would have to specify which opponent.
Source: WotC Chat (2002-05-23)

Relevant cards

Note: All applicable cards may not be listed below.
WOTCB2_16
WOTCB2_16
WOTCB2_41
WOTCB2_41
WOTCB1_14
WOTCFO_42
WOTCGH_63
WOTCJU_36
WOTCJU_44
WOTCLC_42
WOTCLC_60
WOTCLC_63
WOTCN1_58
WOTCN1_70
WOTCN1_8
WOTCN2_41
WOTCN3_23
WOTCN4_55
WOTCSI_7