Rule 810.5 about the Two-Headed Giant game variant says:
810.5. With the exception of life total and poison counters, a team’s resources (cards in hand, mana, and so on) are not shared in the Two-Headed Giant variant. Teammates may review each other’s hands and discuss strategies at any time. Teammates can’t manipulate each other’s cards or permanents.
Now, my question is: Is it possible to enchant or target my teammates' permanents or does this rule forbid this?