CXyz Battleship Cherry Blossom

The monster effect "Once per turn, during your opponent's End Phase, if your opponent has more cards in their hand than you do: Your opponent chooses 1 card in their hand and discards it" is a Trigger Effect. (This effect does not target.)

The monster effect "Your opponent chooses 1 card in their hand and discards it" is a mandatory effect that activates only once during the End Phase of the opponent's turn if the opponent has more cards in their hand than you do.

"If this card has 'Battleship Nadeshiko' as an Xyz Material, it gains the following effect" is not treated as an effect. (While 'CX Battleship Taoyame' itself has 'Battleship Nadeshiko' as an Xyz Material, it gains the '●' effect.)

The monster effect "You can detach 1 Xyz Material from this card; inflict 300 damage to your opponent for each card on the field" is an Ignition Effect. (This effect does not target. Detaching 1 Xyz Material from this card is a cost to activate this effect.)

When the monster effect "inflict 300 damage to your opponent for each card on the field" is applied, you inflict damage to your opponent equal to the total number of cards on both fields at the time of effect resolution multiplied by 300.