The cards exiled this way can be cast as long as theyre in exile, so even if Ixhel gets destroyed or removed from the battlefield, those cards are yours.
Usually, sideboards need to reserve some space for Artifact, and Enchantment removal effects, but Boseiju allows such effects to be run in the main deck
"One Piece Card Game Releases a Live-Action Alternate Art Collection"
Once per turn (Quick Effect): You can send 1 card from your hand to the GY, then target 1 face-up card on the field
Card type: Monster (Aqua/Xyz/Effect) Level: 2 Well admit it: this card is on the list for its cuteness factor more than anything else
There are three main ways to do so: knock out enough opposing pokemon to collect all six Prize cards, render the opposing trainer unable to battle by leaving them no pokemon on their side of the field, or by the technical victory of making one's adversary run out of cards to draw from their deck