"Alien" Decks focus heavily on exploiting A-Counters, which weaken opposing monsters when they battle "Alien" monsters and facilitate the effects of "Alien" cards and related support
With Kamigawa: Neon Dynasty come three primary cycles of rare cards
Exchange of Words FromTheShire: Cheap, and there's a ton of text boxes you are going to want to steal, whether it's some nasty Annihilating Eldrazi or simply someone's Commander that you really think should have the text of a Saproling instead of whatever nonsense it was doing a second ago
But what really makes Hullbreaker Horror so good is how it combos with so many cards to enable some truly silly things
Pull rate from Rare Packs: 3.85% The estimated pull rate for Cynthia (Space-Time Smackdown) from a Rare Pack is approximately 3.85%, meaning you might need to open around 27 Rare Packs to obtain it
For the cost of one card, you can immediately add a pair of scales and summon an in-archetype monster right away for whatever purpose you may need