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A Shard token is a colorless Shard enchantment token with “{2}, Sacrifice this token: Scry 1, then draw a card.”

A Sorcerer Role token is a colorless Aura Role enchantment token named Sorcerer with enchant creature and “Enchanted creature gets +1/+1 and has ‘Whenever this creature attacks, scry 1.’”

Scry

To “scry N” means to look at the top N cards of your library, then put any number of them on the bottom of your library in any order and the rest on top of your library in any order.

If a player is instructed to scry 0, no scry event occurs. Abilities that trigger whenever a player scries won’t trigger.

If multiple players scry at once, each of those players looks at the top cards of their library at the same time. Those players decide in APNAP order (see rule 101.4) where to put those cards, then those cards move at the same time.

If the chosen target is an illegal target by the time Riddle of Lightning tries to resolve, the spell doesn't resolve. You don't scry 3 or reveal any card.

If a card in a player's library has {X} in its mana cost, X is considered to be 0.