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
One of the key moments of that was Louisoix sacrificing himself to save the future, and FFXIV's ARR begins with your character meeting twins Blue Alphinaud and Red Alphinaud (Alisae) Leveilleur, who are Louisoix's grandchildren
It's essentially negative ramp, but you gain a bit of card advantage
For three ink, you can play this card to ready a character
Elsa, Spirit of Winter can herself quest for a mighty three lore and challenge with four strength, making the Amethyst card pretty powerful across the board
Then you can tap this with three mana to sac two artifact and then draw that card