Its pretty easy to buff Elizabeth with Flowering of the White Tree and the like
It's strong everywhere, but it has enhanced value in archetypes that care about counters generally, +1/+1 counters specifically, proliferate tricks for multicolor brews looking to add loyalty counters for their planeswalkers, four and five-color decks, Commanders with evasion, Commanders with a power that, when increased by 1 get a faster kill, Equipment, Aura, and Voltron decks looking to get in kills with their Commander, and loads more
Using the tips from that guide can help you lay the foundation to build a solid prerelease deck
Her ability to generate thopter tokens that can be used (similarly to Prossh, Skyraider of Kher) for various combos, including infinite damage, infinite mana, and infinite life
Here's the basic rule, your opponent cannot do anything prior or during your flip to influence how it falls