Ok just played like 20 games on the first day (dont reccomend playing this much)
Best rune for taliyah is probably comet, it does double dmg on 750 range (tali q = 1000 range) so easy to proc it on max distance
Deathfire touch is decent especially with burn built but the damage is a bit little but sometimes it pops off im unsure, its viable but not broken by any means.
The phase rush replacement: stormraiders surge feels good once procced but its not reliable enough to proc consistently, if u play from ahead it feels amazing cuz u can chase them down and it feels like old phase rush that was just broken. but if u play from even and especially from behind, u barely proc the 25% dmg threshhold so it prob needs a lil buff to be her 'best' rune
Overall opinion: Taliyah buffs (nerf reverted) is a blessing, makes her feel alot more playable and any rune in sorcery works well. (comet, deathfire touch, stormraiders) all are viable and i suggest u play around and see what u like most