Here are some ideas for potential replacements for valk and rez. From a mid diamond main healer player (most hours on Mercy overall).
Keep healing at 50hps and keep valk but make heals during ult 70hps to make it feel more like a high impact support ult. Rez would be removed and replaced with an ability that was designed by the youtuber Blame the Controller. His ability idea is called Miracle Worker and does the following.
9s cooldown (id prefer 10-12)
Single target ability that lasts 5 seconds or until ally takes lethal damage. If the ally takes lethal damage before the 5 seconds are up, they are healed for 50 and death is prevented unless they take more damage. If the ally doesn’t take lethal damage and the 5 second timer runs out, they are healed for 100. Similar abilities include Ana’s bio nade which does 100 burst healing and increases healing done (can be used to save near death allies) and Brigitte’s repair pack, which heals for 150 and has an overheal that provides temporary armor (also can save near death allies). This would be a good replacement for rez since it has counterplay potential and prevents death instead of erasing kills.
Option 2:
Replace valk with a new ultimate that I came up with. Name is wip but I’m thinking either Angelic Light or True Form. This ability is a cone ability, like earthshatter, but instead of stunning enemies, it blinds them. Here are some details.
Ult charge increased by 15%
A cone blind ability that happens after a 1.5 second cast. All enemies, even behind shields, that are within los of Mercy within a large cone infront of her are blinded by an intense light for 3 seconds. The enemy will slowly regain vision over those 3 seconds. They will still be able to move during this ult and forms of counterplay include being out of the cone radius, or hiding behind objects in the environment. This would tie in well with her whole angel shtick since, in lore, an angel’s true form is so bright and intense looking at it causes blindness or insanity. This could set up for interesting plays and would incentivise team work to hit the enemy while they’re blinded.
Her E ability could be either Miracle Worker, or a version of Valk that lasts 5 seconds, no aditional mobility is granted, chain beams heal / damage boost by half of its normal value while the targeted ally is healed / dbed for normal value. And the cooldown would be 12s.
Too op? Too underpowered? Any changes you want to make? Let me know what you think!