Domestication

Enchantment — Aura    (CMC:4)

Enchant creature You control enchanted creature. At the beginning of your end step, if enchanted creature's power is 4 or greater, sacrifice Domestication.

53 M14 • ENJesper Ejsing

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Legal in: Modern,Extended,Zendikar Block,Legacy,Vintage,Freeform,Prismatic,Tribal Wars Legacy,Tribal Wars Standard,Classic,Singleton 100,Commander

Oracle Text (click to copy):

Domestication {2}{U}{U} Enchantment — Aura Enchant creature You control enchanted creature. At the beginning of your end step, if enchanted creature's power is 4 or greater, sacrifice Domestication.

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6/15/2010
Domestication's triggered ability has an "intervening 'if' clause." That means (1) the ability triggers only if the enchanted creature's power is 4 or greater as your end step begins, and (2) the ability does nothing if the enchanted creature's power is 3 or less by the time it resolves.
6/15/2010
Domestication can target, and can enchant, a creature with power 4 or greater. The enchanted creature's power is checked only when the triggered ability triggers and resolves.
6/15/2010
If an effect changes the enchanted creature's power until end of turn, it will still have the modified power during your end step.

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