Tomorrow on the other coast, a special activation is taking place at Disney California Adventure as the new chapter arrives, which you can find out more about here
By all your Slivers indestructible, you have stopped all forms of removal except exiling effects, anything doling out -1/-1 counters, or a similar effect
Snow Villiers While lacking some of the downside of some similar creatures, you also have a capped upside on a middling cost creature without evasion who can be rendered impotent by destruction of other things
Creature-based removal tends to involve enters abilities which are easily exploitable with cards like Panharmonicon to double the triggers or Thassa, Deep-Dwelling to trigger them over and over again
Some stores run unsanctioned Vintage events that allow proxies, while many people have some number of proxies in their cube or in their Commander decks
Springleaf Parade This might be the sleeper hit of the set