[BDSM-Themed Single] Bound Jacket

[Kingdom Xathers]

[b][color=#ff8c00]Bound Jacket[/color] [i](Appearance-wise, resembles an emaciated male form wearing a straightjacket and a full-faced leather mask. When its effect is triggered, it gains a considerable amount of muscle and bulk, able to rip out of its bindings)[/i][/b]

[b]DARK/Lv 4/Fiend/Effect/0 ATK/0 DEF[/b]

[b]Whenever your opponent takes Effect Damage; this card gains ATK equal to the damage inflicted to your opponent, until your next Standby Phase. If this card would be destroyed by your opponent's card effect: discard 1 card from your hand; inflict damage to your opponent equal to half of this card's current ATK, then destroy this card.[/b]

[Bahamut - Envoy of the End]

And how would I inflict enough damage to make its attack anyway meaningful how?

Unless you get like three of them out, and then up to some attack, and then your opponent foolishly goes to destroy 1 of them to triggers its heavily disadvantaging effect to boost the other two, and all this takes place during your main phase 1...

...yeah, not good. Permanent attack gain would be the first thing I do, unless you can suggest a plan that makes it viable as is.

[Love of Ghibli]

The description sounds like Bane from Batman.

This would be useful in gift card burn seeing as you could deal 3k damage to a person and swing for 3k. But that is the only deck I can think of that burns enough and doesn't drastically get slowed down by having this card in the build.