It's one of the more staple cards to have in black decks or decks with black in it
Portuguese Regra de Ouro (Este card deve ser sempre considerado como um card "Cristalino(a)".) Coloque 2 monstros "Fera Cristalina" do seu Deck com a face para cima na sua Zona de Magias & Armadilhas como Magias Contnuas e, depois, Invoque por Invocao-Especial 1 monstro "Fera Cristalina" da sua mo ou do Cemitrio com um nome diferente que o desses cards e, se isso acontecer, equipe-o com este card
In general, the rarer the card, the more valuable it is
Artifact creatures can also work well with the historic mechanic and cards like Jhoira, Weatherlight Captain or Teshar, Ancestor's Apostle
Again, this plays nicely into the mentality of a defensive magical spell, and just like the elements above, Blue played a fair bit with the element of water and air -- which, coincidentally, are blue-coloured in art
Unsurprisingly, perhaps, the current recorder holder is one such card, with the other four likely to sell for considerably less than the 32 grand it raised in the event that they ever go to auction