Jinxed Choker [Mirrodin] Zombie Cleric that creature gains "{2}{G}{U}: Double

that creature gains "{2}{G}{U}: Double the number of +1/+1 counters on this creature

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Set: Unlimited Edition Type: Artifact Rarity: Rare Cost: {4} All Swamps are 1/1 black creatures that are still lands

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Phenax isn't a creature

Jinxed Choker [Mirrodin] Zombie Cleric that creature gains "{2}{G}{U}: DoubleSet: Mirrodin Type: Artifact Rarity: Rare Cost: {3} At the beginning of your end step, target opponent gains control of Jinxed Choker and puts a charge counter on it. At the beginning of your upkeep, Jinxed Choker deals damage to you equal to the number of charge counters on it. {3}: Put a charge counter on Jinxed Choker or remove one from it.