Catti-brie of Mithral Hall

First strike, reach Whenever Catti-brie attacks, put a +1/+1 counter on it for each Equipment attached to it. {1}, Remove all +1/+1 counters from Catti-brie: It deals X damage to target attacking or blocking creature an opponent controls, where X is the number of counters removed this way.

From Magic: The Gathering.

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