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While this particular interaction isn't quite as explosive as it seems, Toph, The Last Metalbender does fuel plenty of funky interactions

C Common Blackwing - Tornado the Reverse Wind X DARK Level 4 [ Winged BeastEffect ] ATK 1000 DEF 1200 When this card is Normal Summoned while your opponent controls a Special Summoned monster: You can target 1 "Blackwing" Tuner in your GY

This is a guess though, are there any genwunners or WOTC purists that could weigh their opinion on how an early ex compares to a mid ex Holo to them

That might not be the strongest combination Blood Crypt enables, but it will likely be one of the most beloved