Classic Luminaryby simoconfa
I would like to spend some words on Relativity.
This card on the default deck is a 3/5 but honestly I don't recommend that value. If a flank is on you, you cannot hope that you can survive only healing a player, at 90% you will be always dead. So, since that ability is needed but not used often I lowered that to 1/5.
I would like also to speak about Lightyears. After the nerf from a 10% base to 4% base, it seems still a good choice. Playing without range is reasonable only for a Power Cosmium or Binary Star Jenos. We need to consider also that Jenos is one of the weakest damage (when he is luminary). Moreover Jenos is generally used in an aggressive/high dmg team so he cannot afford to push hard together with team. Actually, I would use the build above only in very short maps only if you are single healer. You can also play Jenos with another offhealer.
Lightyears 4/5 and Astral Cycle 4/5 to have some more range.
Lightyears 5/5 and Astral Cycle 3/5 if you are running double support (a dmg Ying for example) or if you are obliged to heal as a single healer in a long map.