Thorncaster Sliver

Counter target spell.

Sacrifice a creature: Scry 1. (Look at the top card of your library. You may put that card on the bottom.)

(T: Add W.)

As an additional cost to cast this spell, sacrifice an artifact or creature. Draw two cards and create a Treasure token. (It's an artifact with "T, Sacrifice this token: Add one mana of any color.")

(T: Add U.)

Lightning Bolt deals 3 damage to any target.

(T: Add B.)

As an additional cost to cast this spell, discard a card. Draw two cards.