This card uses casualty , which allows you to sacrifice a creature to copy the spell
Not only for providing coverage to a single color pair's innate shortcomings, but because Tarkirs three-color legends are complex powerhouses, packed with abilities that would only be possible if they required some effort to cast
These abilities put those to good use
But this card is so strong that its deck is simply called Gren Maju
The commander may be a game-ending threat by itself or provide the ability to snowball fast via the advantage they can generate
As another example, if my opening hand has a one-drop, a two-drop, a three-drop and four different four-drops, then I will usually bottom the worst three four-drops in the hope of drawing into a powerful five or six-drop, while keeping the cards that will ensure a perfect 1-2-3-4 curve-out