The most important cards in a stax deck are: If you combine these cards with decks that synergize well with them, you come out with the advantage
You can throw in a card like Teferis Protection which is just generically good, but with a deck whose theme is this prevalent, I like to try to stick to it as much as possible
They play fragile creatures and have exclusively creature-based win conditions, daring you to try and beat them with the same one-for-one removal that characterizes the fair world Abzan lives in
What Is the Cleanup Phase
This ranges from +1/+1 counters on a creature you control to -1/-1 counters on a creature you (ideally) dont control to planeswalker loyalty counters, charge counters on artifacts, level-up counters, etc
Even outside of that, though, typal based strategies in Modern are not performing well right now thanks to Fury