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Crypt Cobra

Card Name

Crypt Cobra

Mana Cost

3

Type

Creature – Snake

Rarity

Uncommon

rules Text

If Crypt Cobra attacks and is not blocked, defending player gets a poison counter. If any player has ten or more poison counters, he or she loses the game.

Legal Formats

Commander, Legacy, Vintage

Not Legal Formats

Alchemy, Brawl, Explorer, Historic, Modern, Pauper, Pioneer, Standard

Rulings

(10/4/2004)
The player gets a poison counter as a triggered ability on not blocking the Cobra. Killing the Cobra after declaring blockers or preventing its damage will not prevent the poison counter.
(4/15/2013)
An ability that triggers when something "attacks and isn't blocked" triggers in the declare blockers step after blockers are declared if (1) that creature is attacking and (2) no creatures are declared to block it. It will trigger even if that creature was put onto the battlefield attacking rather than having been declared as an attacker in the declare attackers step.