Hidden Blade

spell

[Hidden] (Hide now for rune rainbow to react with later for energy 0.) [Action] (Play on your turn or in showdowns.) Kill a unit at a battlefield. Its controller draws 2.

Rulings

• What happens when my opponent plays Hidden Blade targeting my Akali, Deadly Weapon in reaction to her move trigger? Will it still deal damage to the chosen unit?
• If a unit would be killed by Hidden Blade, but one of these cards replaces that unit’s death, does the unit’s controller still draw 2?
• What does it mean to “kill a unit with a spell?” It seems like Hidden Blade counts, but what about a spell that deals damage? A spell that causes a unit to deal damage? A spell that causes a unit to die in some other way, like Stupefy on a unit that has 1 more Might than it has damage currently marked on it?
• Can Immortal Phoenix return if it is the unit that was killed? Or if it and other units were killed at the same time? For example, can I Hidden Blade on my own Phoenix and immediately replay it?