When Lichs Mastery leaves the battlefield, you lose the game
(You may cast this card from your graveyard for its escape cost.) Skyway Robber escapes with "Whenever Skyway Robber deals combat damage to a player, you may cast an artifact, instant, or sorcery spell from among cards exiled with Skyway Robber without paying its mana cost." The ability Skyway Robber escapes with only allows you to cast cards exiled with its escape ability the last time it escaped
The Travails what residents call the situation with the Eldrazi left an impact on the plane that you can see snippets of in the cardset and the web fiction
However, I don't think he should be in Magic , not at least in the way he's now
Bruna, Light of Alabaster is a good fit too, as it gives you an additional way to get Auras back from the graveyard
Fighting Heliods Company on the stack is all about stopping the payoff creatures, as only a few decks are capable of killing an indestructible enchantment without sideboard cards