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You can tap this with no mana to shoot an attacking dork for 1 damage but only at the end of the combat step, so you'll take it first

So we went all the way up to 121 rares and then we have an additional 40 rares in the set, pushing the total number of cards in the set to an unusually high 332

While I cant find anything confirming why this is, its likely because its on the Reserved List, so Wizards is hesitant to errata something they cant reprint

Commander 2015 actually has a few other cards like this, that extend known mechanics to include additional players or all players

It's not the total mana value of the cards