Like Creature types, the Lesson subtype doesn't have any effect on the mechanics of the card but instead allows other cards to refer to and interact with them specifically
For example, if your main deck has a lot of Thoughtseize and Fatal Push , but you're facing a Burn deck, those Fatal Push are practically dead
Unfortunately, this card's price is more of a nightmare to make sense of, as sales jump around from eight to $12, with little regard for condition
Sapphire can be pretty strong with some cards leading the way to victory quite quickly
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That copy is created on the stack, so it's not "cast." Abilities that trigger when a player casts a spell won't trigger