Nilah, Joy's Formless Blade.

Whenever Nilah attacks, draw two cards and reveal them. During your end step, discard all revealed cards.

{t}, {x}: Nilah deals X damage to all creatures. This damage cannot reduce creatures' toughness below 1. You gain life equal to the total damage dealt this way.

"For this strength, I gave everything. Ah, Well, Bliss
in life, and bliss forever after."