Reanimator is surprisingly difficult to support in an engaging way for how often you see it
The same is true for copies of spells that were put into your graveyard when they resolved or were countered
Take a look at [c]Grapeshot[/c]
Meanwhile, Archon of Cruelty is gaining popularity in Legacy, with occasional showings in Vintage and Modern
Basically, according to Wizards ' own thoughts back in 2015 and the consensus view of the community, the London mulligan rule seems likely to power up two of the most problematic and least liked aspects of the Modern format, and this doesn't even take into consideration that certain cards or decks can directly abuse the rule (most commonly cards or combos that actually want you to have fewer cards in hand, like Restore Balance or Ensnaring Bridge, both of which happen to win by making the opponent unable to play a full game of Magic or, in the case of Restore Balance, any form of Magic at all)
They also got a guild leader and champion, along with a list of creature types unique to their guild