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Iron Bundle has been a staple tech card in Standard for a while, so theres always been a small but consistent source of demand for rare versions of it

But if so

The reasoning behind this is complicated, but essentially the game assumed a Saga with no abilities had completed all of its chapters, which would then cause you to sacrifice it

It is again a Mew3/Fire Box

it gains ATK equal to the number Tributed x 1000 (until the end of this turn), and if it does, it can attack monsters up to the number Tributed during each Battle Phase this turn

Additionally, as a tap-out heavy deck holding mana for counterspells is tough to do