Huh. Well, if the ability is only going off once, this card is overcosted. If this is operating like an emblem, this may be too good. I think I like these cards as one and done, however. Activate, then do something, then put the agenda in your graveyard, clearing up the play space.

An ongoing agenda is like an ongoing scheme - stays around until you play another agenda. This would still work as a one and done - just drop cost a little.
I was just playing around with the design space a bit. Very similar to Sorrow's challenge type and related to Alex' Strategy a little and too your own Goal card.

When I mentioned the similarities between our 4 designs on Sorrow's card, I skipped Alex's design, since it was a bit more like enchantment split cards with some extra functionality on changing the split. That being said, yeah, we are dragging Alex down to our level. :)