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Each creature you tap while casting this spell pays for or one mana of that creature's color.) Choose one or both Counter target spell

This ties our two themes together as you just summon Soul by sending a Stilts Launcher from deck, then you can use its second effect to send Cubic Spells or Traps to the GY for free draws, only to then turn around and exploit those discarded Cubic cards

Chart shows the price of Mysterious Fossil at the end of each month going back as long as we have tracked the item.

Threshold Lands Sleep on Barbarian Ring and Cephalid Coliseum at your peril

On top of that, it also makes you create a 1/1 creature token whenever you cast spells from exile, which is the point of airbending