So here is a breakdown for those
Meanwhile, tokens have been a part of Magic since the beginning, which means you have 26 years worth of sets to draw from for upgrading your deck
That makes it an easy target to fish out of the graveyard with Scrap Trawler and Myr Retriever for an easy way to consistently get back interaction for The Great Henge or Mana Reflection whenever you need it
Now, since the Quicksilvers ability is a new instance each time it copies Vivi, you get a fresh activation
Rather than designing a specific deck from a wide pool of cards, you're drawing from a randomized selection of a single set's cards
Its first ability is often misunderstood, and reads: If a modular triggered ability would put one or more +1/+1 counters on a creature you control, that many plus one +1/+1 counters are put on it instead This means that whenever one of your modular creatures dies, it will move an additional counter in the same way that hardened scales does