rare charizard card ex 116/080}Mega Fire Inferno X (90x Discard any amount of Fire Energy from among your Pokémon M Charizard EX (Y) 013

That stamp matters a lot for price, because 1st Edition sells for far more, so the first thing to check on any shadowless card is whether it carries the stamp

C Common Neverending Nightmare Absorber X WATER Level 2 [ FairyEffect ] ATK 0 DEF 0 Gains 1000 ATK each time your opponent activates a monster effect

While it doesnt have any triggers when dealing combat damage to a player (unlike other swords such as Sword of Fire and Ice), The Masamune supplies an additional benefit: If a creature dying causes a triggered ability of this creature or an emblem you own to trigger, that ability triggers an additional time. That was rather wordy, so its worth noting a few things: 1

Optimally, Sky Striker Ace Shizuku would be summoned in the left Extra Monster Zone such that its top-left Link Arrow points to the 3rd Main Monster Zone, while Sky Striker Ace Kagari would be summoned in the right Extra Monster Zone such that its top-right Link Arrow points to the 3rd Main Monster Zone