how could I forget my boy?
Garruk's Companion -> Kalonian Tusker
Garruk's Companion was an all-star in Duels of the Planeswalkers, so I really want to keep it here as a solid 2-drop that enables Green Devotion. However, the 3 toughness on Kalonian Tusker just makes it such a better blocker and attacker.
Brave the Elements -> Defiant Strike
Defiant Strike cantrips and triggers Heroic, whereas Brave the Elements is purely a mono-white Aggro card.
Risk Factor -> Akroan Crusader
Risk Factor is a meme, Akroan Crusader is a filler-level Heroic enabler.
Yasova Dragonclaw -> Gladecover Scout
Yasova Dragonclaw is not really worth it for 3 mana. The 2 toughness and necessary board state and mana investment make it a poor choice. I don't really care about keeping the cycle of Khans in the cube. Gladecover Scout is an elf, and enables and signals a whole archetype.
Removing a filler-level equipment to add in a filler-level Heroic enabler that helps reduce the card disadvantage inherent in the archetype.
Conclave Mentor -> Dromoka's Command
There isn't enough consistent +1/+1 counter synergy to justify breaking the cube ethos for Conclave Mentor. Dromoka's Command is flexible and was a Standard all-star during Khans block.
Daghatar the Adamant -> Fleecemane Lion
Adding another threat with the potential of Hexproof to go with Gladecover Scout and all the enchantments being added to the cube.
Agent of the Fates -> Alpha Authority
More hexproof support for Bogles and Heroic. Agent of the Fates is so cool, but black doesn't have enough support for Heroic.
Aqueous Form supports Heroic and Bogles while providing some card selection to Tempo decks.
Accorder Paladin -> Ethereal Armor
Adding more support for Bogles at the cost of Humans / White Aggro.
Kor Hookmaster -> Hero of Iroas
I don't love Hero of Iroas here, because there are very few auras that cost more than a single mana. However, this is an attempt at putting in more Heroic support that could also be a filler-level 2-drop in Humans or Soldiers.
Advent of the Wurm -> Selesnya Charm
Advent of the Wurm is so fucking cool and goofy. However, Selesnya charm is flexible across multiple archetypes.