Double Rare and PromoCard rarity, with a unique card number, making it a valuable collectible item
While abusing ETB effects is the most common use for a deck designed around blinking permanents, its easy to forget that a properly timed blink card can effectively counter a removal spell
However, it protects Dinosaur-type monsters that were special summoned from the GY from card effects, which is useful because of the monster type's playstyle
We can blink and bring the target right back if we need its trigger again, to counter targeted removal, or to simply get it untapped
To get cards for it, the Secret Packs are Stalwart Force and Immortal Royalty
The Darkness Crystal is fine and might actually be a funny sideboard card against the sacrifice decks because it turns off death triggers, but its usually not worth the mana investment