(6/6/2025) Although the ninjutsu ability has the creature enter the battlefield attacking, it was never declared as an attacking creature (for the purposes of abilities that trigger whenever a creature attacks, for example)
Card Name Mana Cost Type Legendary Planeswalker Karn Rarity Mythic Rare rules Text Activated abilities of artifacts your opponents control can't be activated.+1: Until your next turn, up to one target noncreature artifact becomes an artifact creature with power and toughness each equal to its mana value.2: You may reveal an artifact card you own from outside the game or choose a face-up artifact card you own in exile
Because his ability counts any creature dying, Sephiroth makes combat an absolute nightmare for your opponent, and transforming him is very much on the table, especially when he has a nice "enters or attacks" trigger
This marks the third type of Trainer Cards added to the game, leaving Stadium Cards as the only remaining untapped category
I also like to keep a mental note of -5 cards when I side out the KCS package, having the possibility of siding 5 cards
But if you arent lucky, this is 3 mana spent for nothing