If there was an award for Card Most Likely to Make You Miss a Trigger Because Its Doing It Constantly, Trouble in Pairs would be a shoe-in
Kami of the Crescent Moon You need Kami of the Crescent Moon for your Alandra, Sky Dreamer deck
Otherwise, if a face-up Red-Eyes monster on your field is destroyed by battle or card effect, inflict effect damage via Red-Eyes Burn, while you can Special Summon various Red-Eyes monsters with Return of the Red-Eyes, allowing you to fight with all sorts of Red-Eyes cards
Aside from that, it distributes mana to each player, and, as an unexpected receiver of said mana, it can be interesting to find ways to filter that mana into different mana sinks to avoid the inevitable mana burn
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Duel 118 ( Duelist Duel 59): "The Legendary Swordsman" Yu-Gi-Oh