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)
With 24 Defenders in the deck, these cards can easily generate huge amounts of mana with their tap abilities
Rebound is a neat mechanic that lets you exile the spell when it resolves and then lets you cast it again at the top of your next upkeep step for free
The card is a benefit connected to the qualifying experience, not permission to bypass venue rules
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