As of this ruling, public information also includes the format being played this means, for example, that any card whose effect is only to search for cards with a Rule Box, such as Electromagnetic Radar or Cherish Ball, cannot be played from your hand, since the game knows that there cannot be any targets for these cards in your deck for you to find
Illustrated by Izzy Standard Not Legal Alchemy Not Legal Pioneer Not Legal Historic Not Legal Modern Legal Brawl Not Legal Legacy Legal Comp
Red meanwhile has Lavabrink Floodgates, which taps for two red, and eventually becomes a board wipe if enough folks at the table demand one
whether youre saving a creature from a removal spell or getting a bonus Eternal Witness trigger, theres plenty of ways to make use of this effect
As a result, there will be a lot of fun to be had discovering all the new, tricky ways you can manipulate your board state to set up coven on the fly