Spark's Assistant

When Spark's Assistant enters the battlefield,
exile a card from your hand, then exile the top
card of your library, you may cast those cards
untill end of turn. If you do not, create a
colorless Treasure artifact token with "{t},
Sacrifice this artifact: Add one mana of any
color to your mana pool." at end of turn.
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"Even the smallest minds can uncover the
biggest secrets!" -Spark, Goblin Researcher