Hunting the White Snail

(As this Saga enters and after your draw step,
add a lore counter. Sacrifice after III.)
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I: Destroy target vehicle.
II: Put X -1/-1 counters on target legendary
creature where X is equal to half the
creatures toughness, rounded down.
III: Destroy target legendary creature.
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"I said "Whale", not "Snail"!" - Captain Ramirez