The only realistic out is mourner drawn for turn, because no way they're holding it during your combo
For our full ranking of high-value Japanese cards, see the most valuable Japanese Pokemon cards guide
Once per turn, if you do not control a "Buster Blader" monster: You can target 1 "Buster Blader" in your GY
Special Summon 1 monster from your hand, Deck, or Extra Deck that has 2 or more of the same Type, Attribute, and/or ATK (but negate its effects), and if you do, negate that targeted monster's effects, also, after that, if these monsters have the same name, you can banish both, face-down
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The tip of his tail is actually white in this image, but that appears to just be a highlight