And where do those spirits go
An Aura that phases in unattached will be put into its owner's graveyard as a state-based action
Each of these decks relied on multiple (dozens) of copies of a certain card to overwhelm the opponent with synergy and unmatched consistency (see, for example, The History of Vintage by Steve Menendian)
Beyond offering your board a hypothetically mind-boggling +50/+50, this Jodah also features a Cascade variant
Whenever a player taps a land for mana, if Barbflare Gremlin is tapped, that player adds one mana of any type that land produced
While having an Astartes or a Dalek in your deck may be flavourful, so far it's caused one big problem: how is the card going to be reprinted later on, when Wizards of the Coast no longer has access to the license