The only condition was that they were part of sets that featured Ravnica, including cards from the original Ravnica block, the Return to Ravnica block, and the (unofficial) Guilds of Ravnica block
Because youd feel powerful holding a copy, because you want to show it to your friends, because you want to feel connected to Magics earliest days
Some more unique options to the deck include Perilous Research, which just needs to eat a wraith to act like an instant speed Night's Whisper
Each activation improves card quality or advances mana development, which gradually pulls the deck ahead without forcing risky plays
At the same time, we work on Magic sets before you ever see them, and it's impossible to know what changes might be made to an actively shifting game
Calix comes down earlier, its true, but having more than one of this effect in your deck isnt exactly bad