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That Xyz Monster must have 2 or more materials attached to activate and to resolve this effect

EDH, 60 card casual, standard, or Eldrazi (modern), it doesn't really matter, as long as everyone is ok with the decks being played

Many cards can reduce casting costs by sacrificing something as well, but the fact that you can sacrifice a treasure token for mana to essentially get a reduction of 3 mana is incredible

Opponents will know what choices opponents earlier in turn order made, although cards chosen to be discarded this way won't be revealed until they're discarded at the end of the process