If the damage on a character equals or exceeds its Willpower, the character is banished during the appropriate game-state check
This card also has the Victory Pose ability, which states that during your turn, whenever this character banishes another character in a challenge, you gain two lore
Four mana for a one-sided Howling Mine is already not the worst place to start, although that on its own would hardly be impressive
Of course, purchasing Jumpstart sets wont quite work for making Booster, Standard or Commander decks and would likely end in sadness for anyone attempting such a feat
Cards that generate additional mana, like Mana Reflection, Mirari's Wake, and Nyxbloom Ancient, can help accelerate your mana production and enable you to cast this powerful monster and other devastating ones like Avenger of Zendikar
The transparent front and opaque back ensure its tournament-ready