For example, players A, B, C, and D are playing a game, in that turn order
The spell in question is from a specific spellbook, and each one also allows you to spend mana as though it were of any color to cast it
Repeat for infinite landfall triggers
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That argumentation applies even more to Legacy than Modern since you clearly see Expressive Iteration being extraordinary in Delver, good in Control and non-existing in absurdly strong combo decks like Storm, Doomsday or Sneak & Show
In terms of design it is a wonderful card, highly fair like Chrome Mox yet far less able to make games dull and over before they really start than the Mox