Activate Emry by tapping it, targeting Lion's Eye Diamond.
Cast Lion's Eye Diamond from your graveyard by paying 0.
Displacer Kitten triggers, blinking Little Bear.
When Little Bear enters, it triggers, untapping Emry.
Activate Lion's Eye Diamond by discarding your hand and sacrificing it.
Repeat.
This intricate loop turns Emry, Lurker of the Loch into a relentless engine by utilizing her tap ability to continually pull Lion's Eye Diamond out of your graveyard. Every time you cast that Diamond, Displacer Kitten's avoidance ability triggers to blink Little Bear, whose own entry trigger refreshes Emry by untapping her. Because Lion's Eye Diamond can be cracked in response for mana before you repeat the cycle, this setup generates an endless supply of colored mana, storm count, and artifact triggers to overwhelm your opponents.