A blue card is any card with a blue color identity, typically identified by its blue mana cost or a color indicator
If your life total can't change and an effect would set your life total to a specific number that's different from your current life total, that part of the effect won't do anything
When it attacks, sacrifice it at end of combat.) Sorcery Color tag templates(None) Kaya's Ghostform Enchant creature or planeswalker you control When enchanted permanent dies or is put into exile, return that card to the battlefield under your control
At minimum it's 5 mana and an attack trigger towards the specific player, and unless your engine is churning already your Elves may well not be big enough to kill the thing you want dead, or to survive the ensuing combat
Most lords buff power and/or toughness of other elves you control, and thats the classic definition of a lord
Azula, Cunning Usurper Azula, Cunning Usurper provides through firebending, but gets the Dimir classification because the ability isn't tied to color identity