The Assassin is a Dimir flashable 3/3 that enters the battlefield tapped as a Clone of any dork and then can destroy it like an six-mana Ravenous Chupacabra that leaves behind a tapped Clone of that dork you just killed and can serve as a Clone of your key dork instead if that is how the battlefield plays out
Pinnacle Emissary will create a Drone for each artifact you cast and, since Drix Interlacer cares about artifacts entering, it will essentially get two counters for every artifact you cast
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Plenty of goblin decks care about the number of goblins you have out, especially ones built around Krenko, Mob Boss or Muxus, Goblin Grandee
Chalice of the Void with one counter will not react to Suspending Rift Bolt (because it is a special action, not casting a spell), and Chalice with zero counters wont react to casting Rift Bolt, as its mana value is three, not zero