Nullstorm

Whenever you draw a card, you may instead
discard that card. If you do, counter target spell
with converted mana cost X or less, where X is
the converted mana cost of the discarded card.
{1}{u}{u}, Discard a card: Draw a card.
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"I never though that so much power could be
harnessed through mana and a bit of lightning."
—Averon