You are missing one point.
You can make an epic stall, but that won't won you the game either
But I am thinking of an ability cost, so use 1 air to get another turn of pacifism, and a soon as you don't do so, the dove will be destroyed.
But once I have an epic stall set up, I have so many ways to win the game that can't be countered.
1) I play eternity and just bounce a photon repeatedly until you deck.
2) I play fire and build up all the quanta I need for an instant kill.
3) I just wait until I have enough damage on the board for a one turn kill, and use the dove's set free ability (which makes it even more OP).
Additionally, it completely stalls out all rushes, giving you whatever time you need to set up. Sundial was way overpowered, and it only lasted for 2 turns. This lasts for as long as I want.
Adding a cost wouldn't fix it really, unless perhaps it was huge (like 5+) because it still acts as a repeatable sundial.