This card has seen play in multiple Legacy archetypes, in Modern Affinity, and Standard Prowess, and its only been online for a few days
All Arabella, Abandoned Doll cares about is the number of creatures with power 2 or less
Rot Farm Mortipede Gaining access to two keywords is nice, but Rot Farm Mortipede is still firmly in Limited-only territory, and it's not particularly great there, either
If they don't know your strategy, you could try and fool them, or just pick three super-cards and watch them struggle to guess which one is least dangerous
This combo is meant to be played on multiple turns, as Demonic Pact requires the player who controls it to choose one of four different options, one of which reads "You lose the game." What follows is that players need Harmless Offering to cede control of Demonic Pact, but only after the first three options have been used in order to have the opposing player get the Enchantment with no other option but to lose the game at the start of their turn
#10 Mana Vault - Golden Age I'm confused, but for this amount of mana it's worth it