Many serious Modern players are going to want complete play sets of this entire cycle for their quiver, and Commander players will find reasons to want them too
Several factors influence Sun & Moon card values: card condition (mint cards worth 3-5x more), rarity (holographic and rare cards command higher prices), first edition status, PSA/BGS grading scores, and market demand for specific Pokemon
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They were toys
The lack of Elvish Mystic or Delver of Secrets means that those lands wont be helping to power out extremely aggressive starts with whatever color of mana you need at the early stage of the game, but that doesnt mean theyll be any less played