Emry, Lurker of the Loch

Mana cost: {2}{U}
Type: Legendary Creature — Merfolk Wizard
Power / toughness: 1 / 2
Set: Throne of Eldraine #43 (rare)
Price: $1.66 USD

Affinity for artifacts (This spell costs {1} less to cast for each artifact you control.)
When Emry enters, mill four cards.
{T}: Choose target artifact card in your graveyard. You may cast that card this turn. (You still pay its costs. Timing rules still apply.)

Emry, Lurker of the Loch has 12 printings, first in Throne of Eldraine (2019). EDHREC ranks it #603 among Commander cards. It appears most in Breya, Etherium Shaper decks (11,750 on EDHREC). 3 public decks on TCG run it. It has 7 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 Emry, Lurker of the Loch

Buckle Up - Neon Dynasty Commander, led by Kotori, Pilot Prodigy
Counter Intelligence - Edge of Eternities Commander Deck, led by Kilo, Apogee Mind
Mishra's Burnished Banner - The Brothers' War Commander, led by Mishra, Eminent One

Commanders that run Emry, Lurker of the Loch most

Deck counts from EDHREC.

Often played with Emry, Lurker of the Loch

Cards that show up in the same decks on EDHREC.

Rulings

2019-10-04: The cost reduction ability reduces only the generic mana in Emry's cost. The colored mana must still be paid.
2019-10-04: You'll still pay all costs for a spell cast this way, including additional costs. You may also pay alternative costs if any are available.
2019-10-04: If Emry's last ability targets an artifact land card, you can't play it. Effects that allow you to "cast" a card don't allow you to play a land card.
2019-10-04: To determine the total cost of a spell, start with the mana cost or alternative cost you're paying, add any cost increases, then apply any cost reductions (such as that of Emry). The mana value of the spell remains unchanged, no matter what the total cost to cast it was.
2019-10-04: Once you announce that you're casting a spell, no player may take actions until the spell has been paid for. Notably, opponents can't try to change by how much Emry's cost is reduced.
2019-10-04: You must follow the normal timing permissions and restrictions for the target artifact card. Unless it has flash, you'll most likely only be able to cast it during your main phase while the stack is empty.
2019-10-04: Casting the target card causes it to leave your graveyard and become a new object. You can't cast it again if it returns to your graveyard this turn.