Ive seen it easily hit for 10+ damage in multiple games, and it is an extremely high pick for me in aggro
If you're playing a lot of small creatures, or maybe a commander like Adeline, Resplendent Cathar , then you'll find a lot of opportunities to draw cards - you might even be able to draw cards on opponents' turns with a bit of creativity
All the greatest hits are there: The Winged Hive Tyrant, Malanthrope, Deathleaper, Old One Eye, a freakin Hierophant Bio-Titan, Screamer-Killer, The Red Terror, and a fat Genestealer Patriarch chompin on something
As if this weren't enough, if a card cast by an opponent would be cast without paying any mana, Lavinia immediately counters that spell outright