Most of your characters have good stats for banishing their rivals in challenges, and if they don't there are easy ways to pump them up, either with a song, or as the side effect of a song
40 life formats see most folks just taking 2 each of their upkeeps, but that can drop people more quickly than you realize
Cards like Narset of the Ancient Way and Sorin, Grim Nemesis benefit from discarding a split card since it deals damage equal to the mana cost
Source: TCGplayer Main Genre Fantasy Release Date August 5, 1993 Created by Richard Garfield Video Game(s) Magic: The Gathering, Magic the Gathering Commander, Magic: The Gathering - Battlegrounds, Magic the Gathering: Duels of the Planeswalkers 2012, Magic: The Gathering - Duels of the Planeswalkers, Magic: The Gathering Duels of the Planeswalkers 2012, Magic: The Gathering Duels of the Planeswalkers 2013, Magic: The Gathering Duels of the Planeswalkers 2014, Magic: The Gathering Arena Character(s) Jace Beleren, Chandra Nalaar, Liliana Vess, Garruk Wildspeaker, Nissa Revane, Ajani Goldmane, Nicol Bolas, Teferi, Gideon Jura, Sorin Markov, Ral Zarek
Aclazotz, Deepest Betrayal Aclazotz, Deepest Betrayal does what black can do better than any other color: Force opponents to discard cards
Sisus ability goes a bit further, though, because it allows you to choose which card you take, instead of throwing yourself completely at the mercy of a random draw
