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This universal catch-all has a very limited drawback, tossing the opponent a creature when its slain

Conspiracies aren't legal in Commander unless your playgroup agrees to them

Its been power-crept by Mithril Coat, but people still rock the Plate from time to time

A deck could have as many copies of a card as it wanted

With Parallel Lives or Anointed Procession, that effect becomes absolutely absurd

What Wizards probably meant to write there is that a player is not allowed to declare actions conditional on their opponent's choices , since the opponent's choices cannot be deterministically predicted in advance, meaning that a loop that includes them is effectively probabilistic