Soulshift (on any creature) would now allow you to return target Monk, Spirit, or Arcane card with CMC N or less from your graveyard to your hand. So with Children of the Kami, Monk and Spirit creatures gain Soulshift 2. You do however, create X equal to the number of faction members you control, not just counting Goblins. For example, when you activate Krenko, Mob Boss to 'Create X 1/1 red Goblin creature tokens, where X is the number of Goblins you control.' you would create only red Goblin creature tokens, not Orc/Goblin/Ogre/Troll abominations of nature. This effect does not apply when determining the characteristics of a token you create. The effect of a Faction card does not alter the subtypes of creature cards in your deck, it only alters effects of spells and abilities you control. For example, Goblin Chieftain has 'Other Goblin creatures you control get +1/+1 and have haste.' With Gorefang Clan, this would now mean 'Other Orc, Goblin, Ogre, and Troll creatures you control get +1/+1 and have haste.' If an effect of a spell or permanent you control would refer to one or more of your faction members, it refers to all of them instead. A faction card's abilities take effect and can be activated while in the command zone, similar to an emblem or conspiracy. Some extended rules copied across from an older iteration that still apply:

I figure uncommons/rares/mythics in this environment could have 2/3/4 subtypes in their faction.

Originally I had it limit deckbuilding to only faction members, with this iteration I've removed that to make it possible to use in a limited environment. The idea is that factions could be drafted/played like the conspiracy card type, but only one could be utilised each game by a player. Here's a new card with a further change to the concept, and in the spirit of the challenge its also breaking out of its usual mould of only utilising creature types by adding Arcane to the mix. Faction is a card type I have made on a few cards previously, going through a few changes as I've developed the idea.

Mtg cardsmith enchantment creature