ok you gotta admit that donate is one of the more fun cards to play with... You are actually giving a "Gift" of sorts to your opponent. Maybe look at it as a trojan horse.
Donate
Sorcery 2U
Target player gains control of target permanent you control.
So you can really have some fun giving control of a permanent to an opponent and using that to kill him
So lets post some fun combos with it!
One combo (relatively new) is:
Donate
Vampire Hexmage
Eternity Vessel
Mindslaver
sacrifice Vampire Hexmage to remove counters from your eternity vessel
Donate it to some lucky player
Use a card like Mindslaver to gain control of that player's turn... see where this is going?
Another combo:
Donate
Boomerang
Illusions of Grandeur
Donate the Illusions of Grandeur and Boomerang it to your hand for an instant win...
So post some more Donate combos!