Just watch out for the enchantment, Underworld Dreams, as it goes infinite with Vilis, causing its controller to draw cards and lose life infinitely.
Whenever you gain life, each opponent loses 1 life
The effect of adding red mana often refunds Jeska's Will's mana cost and then some, especially if an opponent has a ton of cards in their hand because they don't have a hand-size limit
It can increase its damage by having more Energy attached, as well as having other cards such as Lucario and Red to support it
Cathars Crusade is insane because it triggers in creature ETB (including Tokens) so in our Rebel Tribal it can quickly buff our Rebels to the point where our attacks will be lethal
With the release of Whispers in the Well, the game will not only be introducing new characters and franchises but will also debut some new game mechanics