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If your opponent controls a monster and you control an "Ice Barrier" monster: You can Special Summon this card from your hand

When an attack is declared involving this card that was Synchro Summoned this turn and another monster: You can make this card's ATK become double its original ATK until the end of this turn

These Fairy-type monsters all have the effect to either mill cards from both players deck to the graveyard, or shuffle cards from either players graveyards into the deck

The scene also never explains what the card does

5 Branded Despia Is Top Tier For A Reason Using the myriad of fusion summons that bare its name, Despia is a top-tier deck build in Master Duel

Multiple copies of this and/or milling cards like Foolish Burial can leave a huge number of Skull Servants in the Graveyard perhaps enough to make Tri-Wight live