Darkrais attack, Night Spear, costs DDC and does 90 damage plus 30 to one of your opponents benched Pokmon
(If a monster with an A-Counter battles an "Alien" monster, it loses 300 ATK and DEF for each A-Counter during damage calculation only.) ATK: 2300 DEF: 2000 [spoiler=Alien Plague] [spoiler=Alien Plague] Alien Plague Continuous Trap Effect: This card's effects cannot be negated, nor can this card be removed from the field, except by its own effect or the effect of "Alien Viral Cure"
Its simple and effective, although it does cost ten mana in total
Sapphire and Steel is a competitive ink combination, but few of the cards in this starter deck see top-level play
I have also included all of the cards that sprang to mind from the cube that fulfil the remit of being a game improving card in an honourable mentions section
There were suddenly two types of players: those who played Seismitoad and those who tried to play something that would counter it