If the creature targeted by Sleep with the Fishes isn't a legal target at the time it would resolve, Sleep with the Fishes is put into its owner's graveyard from the stack
Removing the target of the aura causes the aura to go to the graveyard after everything resolves
In the original Kamigawa block, many Samurai creatures had the bushido ability, which let them get bigger when blocking or blocked
If a creature dying at the same time as the equipped creature (including the equipped creature itself dying) causes a triggered ability of the equipped creature or an emblem you own to trigger, that ability triggers an additional time
They invariably give a turns reaction time at the very least unless you have other thing to offer haste
Its activation is just a tap to put a soul counter on it, pay three life for each soul counter, and put your commander from the command zone into your hand