For example, you might combine Bolas's Citadel and Aetherflux Reservoir, giving you card advantage and life to offset the life loss, or maybe have reanimate loops using Chainer, Dementia Master and Gray Merchant of Asphodel
It can kill almost any Planeswalker and most creatures, except for maybe the best blue card, Murktide Regent
It usually attacks uncontested two to three times and then is sacrificed to Oni-Cult Anvil or cycled with the channel ability
As a staple in Merfolk typal decks in Modern, Lord of Atlantis is a cool addition to The List, and given the Merfolk theme associated with the original Ixalan block, seeing this card as a special guest isnt too surprising
This will trigger Vito (or Sanguine Bond), and make them lose the amount you just gained