Killua Mayonaka, Kokyuzen

Partner
Whenever Killua Mayonaka, Kokyuzen attacks
and isn't blocked, up to two target permanent
cards in your hand gain "Metamorphose {0}
(If you cast this creature for it's metamorphose
cost put it over or under target Human creature
you own. They metamorphose into the creature
on top plus all abilities from under it.)"