This 100-card pre-constructed deck contains cards that are primarily Rakdos colors (Black/Red)
There are a number of resources out there that allow you to plug in your decklist and get a breakdown of what percentage of your cards need specific colors of mana, what the average converted mana cost of your cards is, and other helpful information (Im partial to Tapped Out personally)
VRAINS era, a section for the eponymous anime series and more
On the flipside, for decks with a less doing-damage-each-turn oriented approach, you can have things like Plaguecrafter, Fate Unraveler, or even Sheoldred, the Apocalypse as ways to force sacrifices, or punish drawing cards
What's more, if no other cards are present in your opponent's possession, then it even gives you free rein to annihilate one unit from either their field or hand
Legendary Creature Enchantment - God Icingdeath, Frost Tyrant Flying, vigilance When Icingdeath, Frost Tyrant dies, create Icingdeath, Frost Tongue, a legendary white Equipment artifact token with "Equipped creature gets +2/+0," "Whenever equipped creature attacks, tap target creature defending player controls," and equip