Meditate, mend wounds, warden netch, nb mark, templar restoring aura, necro harvest, siphon, tether – there's no reason why these skills are blocked by negate. These skills cost no resources to cast so it shouldnt be affected by Negate Magic skill and its morphs.
P.S. Not a "nerf sorc!" thread, just current negate has no sense
If the ability has no cost it is considered a magical ability and is thus negated. In fact some of the stamina abilities are magical attacks like Imbue Weapon and I feel like Negate should effect those as well, but they don't because of balance reasons. Negate also effects health cost abilities which makes sense since that sort of stuff is blood magic, but I have noticed Blood Frenzy remains on even while standing in a Negate field. Not sure why but it could be a UI bug as I've seen that ability do other weird things when toggled in Cyrodiil.