Narset, Enlightened Master

Mana cost: {3}{U}{R}{W}
Type: Legendary Creature — Human Monk
Power / toughness: 3 / 2
Set: Commander Masters #931 (mythic)
Price: $0.59 USD

First strike, hexproof
Whenever Narset attacks, exile the top four cards of your library. Until end of turn, you may cast noncreature spells from among those cards without paying their mana costs.

Narset, Enlightened Master has 4 printings, first in Khans of Tarkir (2014). EDHREC ranks it #8,711 among Commander cards. It appears most in Commodore Guff decks (2,121 on EDHREC). 1 public deck on TCG runs it. It has 5 official rulings.

Legality

commander: legal
legacy: legal
vintage: legal
pauper: not legal
modern: legal
pioneer: legal
standard: not legal
brawl: legal

Public decks that run Narset, Enlightened Master

Planeswalker Party - Commander Masters, led by Commodore Guff

Commanders that run Narset, Enlightened Master most

Deck counts from EDHREC.

Often played with Narset, Enlightened Master

Cards that show up in the same decks on EDHREC.

Rulings

2014-09-20: The cards are exiled face up. Casting the noncreature cards exiled this way follows the normal rules for casting those cards. You must follow all applicable timing rules. For example, if one of the exiled cards is a sorcery card, you can cast it only during your main phase while the stack is empty.
2014-09-20: Because you're already casting the card using an alternative cost (by casting it without paying its mana cost), you can't pay any other alternative costs for the card, including casting it face down using the morph ability. You can pay additional costs, such as kicker costs. If the card has any mandatory additional costs, you must pay those.
2014-09-20: You can't play any land cards exiled with Narset.
2014-09-20: If the card has {X} in its mana cost, you must choose 0 as the value for X when casting it.
2014-09-20: Any exiled cards you don't cast remain in exile.