Lists that play both Spy and Dekoichi will sometimes combo them with Night Assailant, who not only brings additional removal to the table, but also neuters Delinquent Duo and other discard effects
10 Ninetales And Rayquaza Cards: 37 Ninetales and Rayquaza are tied for last place, with 37 unique cards each
SDY-044 - Dark Energy
I recently saw a post on Facebook where someone was explaining his Supporter line and the basic logic he used was something like this: I have a 60-card deck and I draw 7 cards, so if I have 10 Supporters, I should basically always have one in hand. That sounds kind of true: yea, verily, 60 divided by 10 equals 6 and 6 is less than 7, but the question we want to answer is not the law of averages, it is really about the hypergeometric distribution of Supporters
Damage engines like Impact Tremors, Purphoros, God of the Forge, Goblin Bombardment, Pashalik Mons, and Throne of the God-Pharaoh let you win without even attacking, while Shared Animosity, Coat of Arms, and City on Fire make combat kills very real