Lightning, Lone Commando (Isshin, Two Heavens as One) One of the best Mardu Commanders around, Isshin definitely fits Lightning's vibe in terms of combat mechanics
Each discard spell you cast can pave the way for your real threats, and your graveyard strategy can ensure you dont just fold to a single well-timed No. And remember, nobody can counter you if they dont have a hand
The deck features 20 additional mythic or rare creatures, nearly all of which allow you to put +1/+1 counters on creatures, have anthem effects, generate human creature tokens, or provide other powerful effects to your army such as lifelink, vigilance, card draw, unblockable, hexproof, etc
Its power and abilities make it a fantastic card to use in a deck, but its the visuals that push the value up
Enchantment - Saga There and Back Again (As this Saga enters and after your draw step, add a lore counter