Koga is an absolute necessity if players are using a darkness-type deck, especially if the deck includes Weezing and Muk
ReanimateReanimate is also a great include, letting you pick up whatever juicy card your opponent discarded
You can use "OP09-106 Nico Olvia" to increase the power of your Leader before attacking, so that more cards are affected by [Banish] and you can win the game without ever allowing your opponent to increase their hand!
SteelSturdy, Hard-hitting, Indomitable
There are around 170 Black and Red cards, include split, hybrid, aftermath, and gold cards, but not cards with a Black and Red color identity, such as Soul Burn
Oketras Monument can lessen the cost of you returning your creatures to the battlefield, for instance