When you "flicker" a permanent, it's treated as a new card that just entered the battlefield
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When multiple of these effects are on the field, you can use the likes of Ghostly Flicker to blink both, return Flicker and an extra card to your hand, and repeat this sequence over and over again, which can be a pain to interact with if the second spell is a counterspell
It is a mercy we grant them
This white instant works best in decks with lots of powerful enters abilities to retrigger, which gives it utility when you dont have to protect your creatures