The ability itself appears only on instants and sorceries (one play-test card exception), and has the ability, "You may pay an additional cost as you cast this spell
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He also has another effect that stops legendary creature tokens being sacrificed by the legend rule
So, in order to maximize that, you'd drop lands and cards from your library first, and then your hand second
Getting to draw cards and create Treasures is great, but not at the expense of losing this creature that you already spent your mana on
Cards from The List will have the Planeswalker symbol printed in their bottom corner similar to the Mystery Booster cards released earlier this year, but they'll also keep their original set symbols