UX Designer Daniel Holt points out, "It only made sense that the helper card itself be a double-faced card that you could 'transform' on the battlefield to indicate what day/night designation it was in
Star Seraph Sword!" When activating the effect of that monster, he says "I activate Star Seraph Sword's effect!" Most of the time, when declaring an attack with that monster, Dumon says "Star Seraph Sword, slash!" When Dumon Summons "Secret Sect Druid Dru" he announces, "Secret Sect Druid Dru!" When activating the effect of that monster, he says "When Druid Dru is Summoned, its effect activates!" Most of the time, when declaring an attack with that monster, Dumon says "Secret Sect Druid Dru
4 Aerith Rescue Mission OK, so, Aerith Rescue Mission doesn't actually feature Aerith herself in the artwork
Beyond these, there are more options from higher to lower power levels
Five decks to start : Once you complete the intro battles, you will unlock five decks, one for each color of mana in Magic