This means you won't be able to deal with it immediately unless you have instant-speed removal and the mana to use it before it phases out, allowing it to make a significant impact on the board
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If one or more +1/+1 counters would be put on a creature, twice that many +1/+1 counters are put on that creature instead
Grapeshot is more often used to deal with problematic creatures like Thalia, Guardian of Thraben and Gaddock Teeg, but its overall versatility is what keeps it in the sideboard
It has ninjutsu for one black mana and three generic mana, and, when it deals combat damage to a player, you exile the top card of each player's library