Once per turn, during your Main Phase, you can Special Summon this card from your GY
"Phantasm Spiral Assault" is a Trap Card that empowers the Normal Monster "Phantasm Spiral Dragon": You win the Duel if that monster destroys three Effect Monsters by battle, but only if it does so while equipped with at least one copy each of "Phantasm Spiral Crash," "Phantasm Spiral Grip," and "Phantasm Spiral Wave." "Flying Elephant" can prevent its destruction by a card effect once per turn, and if inflicts damage with a direct attack the turn after activating its effect, you win the duel
3 MEKK-KNIGHT PURPLE NIGHTFALL A level 8 monster with 2500 ATK, Purple Nightfall is a tad underpowered
First up, we already know the deal from recent Pokmon TCG expansions including Sword & Shield Battle Styles, Sword & Shield Chilling Reign, and Sword & Shield Evolving Skies
They can usually be used once per turn unless specified otherwise