Check the set symbol carefully when buying sealed product
Not only can this allow one to fill their field with a ridiculous force (like 5 Blue-Eyes White Dragons), but can also let a duelist create a near-infinite defensive line of Spear Cretins if one has 2 copies of this card, for they can target each other.
But while plenty of new Pokmon cards release with each set, not all are created equal
During your turn, monsters you control can either attack your opponent, switch to defense position, or activate a special ability if they have one
(2019-05-03) If Spark Double somehow enters the battlefield at the same time as another permanent, it cant become a copy of that permanent
Number Nine At the time, this dragon got some decent heat attached to it