There are several variants of the deck that can be run, but many are simply worse than a more pure build. Its versatility, toolbox ability, nonlinearity and amounts of in-archetype extension are all large points in its favor, and one or more of these will be decreased by adding large amounts of other cards.
The Kashtira variant is currently the best of these variants, and the most competitively viable way to play the deck.
Easily fields multiple large bodies and can play through ht well, but almost always uses its entire hand to combo.
Has strong board-breaking and OTK potential, but is more fragile if forced to go 1st and much weaker into backrow decks than other variants.
Uses Speedroid cards to accentuate the power of the main Kashtira engine, and provides a more diverse ceiling for the deck.
Able to avoid the WINDlocks to a degree, so you have access to more powerful generic boss monsters, but runs a number of garnets and has several prominent chokepoints.
Powerful generics complement the SR combos and offer varied forms of disruption. This variant is weaker if forced to go 2nd, can be fragile due to a relative lack of extenders, and suffers the same problems as many backrow decks in that counters are widespread.