What happens if I use The Destroyer's ability when I have an active Covenant of Eden? His ability is kind of a cost-benefit, except that the cost is paid after the benefit is gained... Based on the rulings with T2 decks that spam Archers-Horses-Forgotten History, it sounds like you can suspend or even "cancel" the pending cost without sacrificing the benefit. Is that how all "costs are paid later" abilities work?
The Destroyer - "Negate the protect ability on an evil Fortress. You may discard a silver Enhancement from hand to discard an Evil Character in a territory. Then, remove this Hero from the game after battle."
Covenant of Eden - "Use as an enhancement or an Artifact. No character may be removed from the game. Instead discard the character targeted for removal."