Core Reinforcement

Edison Card Text
Select and Special Summon 1 "Koa'ki Meiru" monster from your GY in Attack Position. When that monster is destroyed during your End Phase, the controller of this card takes damage equal to that monster's ATK. When this card is removed from the field, destroy that monster. When that monster is destroyed, destroy this card.
Targets
No Damage Step effect
Banlist • Unlimited
Interactions
If a COTH/Core Reinforcement attached to Valafar is destroyed, is Valafar destroyed?!
A continuous revival card leaves the field.
No. Valafar is unaffected by the effect that would destroy it when the trap leaves.
Rulings
edisonformat.net
●This card targets 1 “Koa’ki Meiru” monster in your GY. The effect of “Core Reinforcement” that deals damage to its controller starts a Chain.
●If your face-up “Core Reinforcement” is destroyed during the End Phase by “Mystical Space Typhoon,” you won't take damage equal to the Summoned monster’s ATK.
●If “Imperial Custom” is face-up on the field and the monster Summoned by “Core Reinforcement” is destroyed, “Core Reinforcement” will remain face-up on the field but the controller will still take damage. If “Core Reinforcement” and the monster it has Summoned are destroyed at the same time, such as by “Icarus Attack,” the effect to inflict damage will still be applied.
edisonformat.com
This card targets 1 “Koa’ki Meiru” monster in your Graveyard. The effect of “Core Reinforcement” that deals damage to its controller starts a Chain.
If your face-up “Core Reinforcement” is destroyed during the End Phase by “Mystical Space Typhoon,” you will not take damage equal to the Summoned monster’s ATK.
If “Imperial Custom” is face-up on the field and the monster Summoned by “Core Reinforcement” is destroyed, “Core Reinforcement” will remain face-up on the field but the controller will still take damage. If “Core Reinforcement” and the monster it has Summoned are destroyed at the same time, such as by “Icarus Attack,” the effect to inflict damage will still be applied.