If the top card is a sorcery or creature spell, you can only cast it when the stack is empty during your own main phase
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When it came out as part of the Outlaws of Thunder Junction Commander MTG set in April 2024, Sand Scout was worth around $2, but quickly dropped to a floor of 30 cents and stayed there for a year
Land auras are definitely the way to make the card tick in cube, as you say
There are many red/black creatures and legendary creatures that interact with discard, and this card can fit into these decks
Each player should play one Pokemon each