Each Battle becomes something different when defeated
Given its frequency, it might be better understood as a new standard for JP print cards instead of a defect
For example, pretty much any Magic card could get a boost if Richard Garfield signed it
including faction agnostic payoffs good for either side
Getting a creature for free from your hand is a VERY powerful effect
Azra Smokeshaper Biting-Palm Ninja Blade-Blizzard Kitsune Coiling Stalker Covert Technician Dokuchi Shadow-Walker Dokuchi Silencer Fallen Shinobi Higure, the Still Wind Ingenious Infiltrator Ink-Eyes, Servant of Oni Jukai Liberator Kaito, Bane of Nightmares Kappa Tech-Wrecker Mist-Syndicate Naga Mistblade Shinobi Moon-Circuit Hacker Moonblade Shinobi Moonsnare Specialist Mukotai Ambusher Nashi, Moon Sage's Scion Nezumi Prowler Ninja of the Deep Hours Ninja of the New Moon Okiba-Gang Shinobi Orochi Soul-Reaver Panglacial Shinobi (playtest) Prosperous Thief Sakashima's Student Satoru Umezawa Silent-Blade Oni Silver-Fur Master Skullsnatcher Spring-Leaf Avenger Swarm Saboteur Thousand-Faced Shadow Throat Slitter Walker of Secret Ways Yuffie, Materia Hunter Yuriko, the Tiger's Shadow Yuriko, the Tiger's Shadow