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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 target is already tapped at the time Plunge into Winter resolves, you'll still scry 1 and draw a card.

You can cast Plunge into Winter without a target just to scry 1 and draw a card. However, if you do choose a target, and that target is illegal at the time Plunge into Winter tries to resolve, the spell won't resolve and none of its effects will happen. You won't scry, and you won't draw a card.