Playstyle
Top Vayne is a single target physical damage boss killer. Vayne and Ato have a very strong synergy overall, going both ways. If you play a bunch of Vaynes, Ato will ascend to Chrono Ato very quickly. If you play a bunch of Atos, Vayne can stay in ult form much longer.
Immortal Form 
Her Immortal Form is very strong. Unlike Vayne, Top Vayne doesn't rely on Tumbling. Her main sources of damage at level 6 are Golden Arrow and Rupture Arrow. Golden Arrow causes every 3rd attack on the same target to do 7000% damage (70x damage). Rupture Arrow triggers every 15 attacks, and causes a 5 second damage over time effect. This DoT effect causes 3300% dmg every half a second for those 5 seconds. This is the equivalent of 33,000% dmg overall, or 330x damage. Rupture Arrow also does an additional 10% damage for each point of the targets DEF stat. In God Mode this would be an extra 1750% damage every half second, or 17,500% over 5 seconds, an additional 175x damage. Adding both together this would be 50,500%, or 505x damage.
As far as Arrow Explosion, I've seen underwhelming results from this skill. Considering every 3rd attack from Vayne does 7000% damage, Arrow Explosion only stacking 1000% damage per attack that can be triggered later doesn't sound particularly impressive. Especially considering how strong Rupture Arrow is. Her ult does influence the viability here. Her attack speed increases up to 150% when using her Ult, and each attack stacks two explosive arrows instead of one. Considering that Her ult improves attack speed even more at level 12, this could be a stronger ability then but considering this also benefits Golden Arrow and Rupture Arrow, it seems comparatively underwhelming. This potential is also limited behind a high amount of Ato spam. Theoretically, the best strategy to maximize this ult would be to only run a single Vayne, in hopes of spamming even more Atos in place of other would-be Vayne's.
Overall, Vayne has a great immortal form. If you don't see huge bursts of damage from Arrow Explosion that's fine - Arrow Explosion appears to be the less powerful abilities. Expect most of your damage to come from Rupture Arrow and Golden Arrow, these are your bread and butter. Pursuing big Arrow Explosion results isn't the reccommended approach, however, after every ult, you should still trigger Arrow Explosion, because of the increased Attack SPD and double stacking, that's when the stacks will be at their peak. Even then, the main damage will be those other two skills, and you should expect only a little extra damage from Arrow Explosion.
Skills 
Golden Arrow - Passive
ATK increases by 1000%. Every 3 attacks on the same target deals 7000% Physical DMG.
Arrow Explosion - Passive
Each attack embeds an arrow into the enemy. When Vayne moves, the embedded arrows explode, dealing 2000% Physical DMG per arrow.
Rupture Arrow - Skill (unlocked at level 6)
Every 15 attacks, deals 3300% Physical DMG to the target every 0.5s for 5s. Deals an additional 10% damage for each point of the target's DEF.
End of Days - Ultimate, cooldown
ATK SPD gradually increases over 15s, up to 150% (+100% at level 12), and Arrow Explosion stack gain is doubled.
How to Summon
Top Vayne can be summoned once you have a Vayne use ult 12 times. You can speed this up by getting Vayne's exclusive and Tumbling to speed up her ults, and by spamming Atos.
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