Rakdos, Lord of Riots will have access to a plethora of ways to chip away at your opponents life totals and make your spells effectively free truly free if youre running colorless options like the Eldrazi

Abigale, Poet Laureate Agent of the Fates Akroan Conscriptor Akroan Crusader Akroan Line Breaker Akroan Skyguard Anax and Cymede Anax and Cymede & Kynaios and Tiro (playtest) Anthousa, Setessan Hero Arena Athlete Artisan of Forms Ashiok's Adept Battlefield Thaumaturge Battlewise Hoplite Bloodcrazed Hoplite Brigone, Soldier of Meletis Centaur Battlemaster Chorus of the Tides Cleon, Merry Champion Dawnbringer Charioteers Elite Skirmisher Fabled Hero Favored Hoplite Hero of Iroas Hero of Leina Tower Labyrinth Champion Lagonna-Band Trailblazer Leonin Iconoclast Meletis Astronomer Mindreaver Phalanx Leader Pheres-Band Thunderhoof Rosnakht, Heir of Rohgahh Sage of Hours Satyr Hoplite Setessan Battle Priest Setessan Oathsworn Staunch-Hearted Warrior Tethmos High Priest Tormented Hero Triton Cavalry Triton Fortune Hunter Vanguard of Brimaz War-Wing Siren Wavecrash Triton Weird Angel Flame Wingsteed Rider

Also the previously teased Mega Attack Rare cards, which is a new rarity, these are special illustrations of Mega Evolved Pokmon
His Pokemon tend to start off weak, but evolve into more threatening forms, so you need to strike fast
Also, did I read that right