FLIP: Special Summon 1 "Poisonous Snake Token" (Reptile-Type/EARTH/3 Stars/ATK 1200/DEF 1200). When the "Poisonous Snake Token" is destroyed as a result of battle, inflict 500 points of damage to your opponent's Life Points.
Rulings
Individual Card FAQs
When the "Poisonous Snake Token" is destroyed as a result of battle, it is the opponent of "Cobra Jar"'s controller that takes the damage; so even if the opponent had taken control of the "Poisonous Snake Token" with "Change of Heart", he/she still takes the damage when it is destroyed.
Netrep Rulings
If โCobra Jarโ is flipped while under the control of the other player through โChange of Heart,โ the Snake Token produced by the effect will remain under the control of the player who flipped it.
If the Snake Token is taken control of via โChange of Heartโ and destroyed, the opponent of the player who 'created' the Snake Token by the effect of โCobra Jarโ will take the Life Point damage.