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For one mana, you could permanently change the color of a permanent

Cards like Knight of Autumn or Shardless Agent become repeatable sources of value

(They put the top two cards of their library into their graveyard.) You draw a card and discard a card all while the first ability is resolving

However, if they have an enter-the-battlefield trigger, you will still get the trigger even if the creature has to be removed

While youre not cheating anything heavy into play, it can be powerful to get a good saga, planeswalker, or even a strong value creature on top of your 5/4 flier

Magali has been a Magic illustrator since Theros and these pieces really show masterful contrasts of light and shadow, color and darkness, and life and death even