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From there, the typical win condition is North Wind Avatar

The most notable change (other than the banned and restricted list) was the official ruling that Constructed decks had to be 60 cards at minimum

Its especially powerful with cards that have an additional downside to cast, like discarding a card or losing life

Seriously though, the card is an excellent storm combo enabler, and it sees play in many formats from Modern and Legacy to cEDH

Karoo actually lets you produce more mana with the same number of lands by returning one of your Plains to your hand, and lands like Buried Ruin can help retrieve a mana rock or another key artifact lost early in the game