Put it next to the Active Spot, and discard it if another Stadium comes into play
That's because after lots of science (aka deck-building sessions), the best players and deck builders have realized that the majority of cards in an aggro deck should be focused on one thing: killing the opponent quickly
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White is probably second best at Fogs, with Dawn Charm being a literal fog that can also save a creature or counter a spell targeting you
Do you want to play with it
Realmwalker is sweet card advantage, letting you play creatures off the top of your library