This will give
players something to cheer about... a nice counter to dim. shield.
It would be very amusing to see a deck loaded with generic weapons and shields plus this...
By the way, some things (such as sundials and cloak) reset their countdowns when stolen, will this also occur with donate? That would give a very nice sundial synnergy since it effectively allows you to double the number of turns sundial will block, which would be very valuable to stall decks.
It would also give you a way to ensure your sundial would function at least one turn when facing AI's that are packing PC.
By the way, could you use this to donate relics? That would be pretty funny... they make a good way to clog the opponents hand safely