Guardian Project

Mana cost: {3}{G}
Type: Enchantment
Set: Fallout #997 (rare)

Whenever a nontoken creature you control enters, if it doesn't have the same name as another creature you control or a creature card in your graveyard, draw a card.

Guardian Project has 15 printings, first in Ravnica Allegiance (2019). EDHREC ranks it #322 among Commander cards. It appears most in The Wise Mothman decks (17,325 on EDHREC). 3 public decks on TCG run it. It has 4 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 Guardian Project

From Cute to Brute - Secret Lair Drop, led by Esika, God of the Tree // The Prismatic Bridge
Landing Party - Star Trek Commander, led by Commander Spock
Mutant Menace - Fallout, led by The Wise Mothman

Commanders that run Guardian Project most

Deck counts from EDHREC.

The Wise Mothman: 17,325 decks
Bello, Bard of the Brambles: 11,309 decks
Lathril, Blade of the Elves: 9,043 decks
Yarok, the Desecrated: 5,458 decks
Animar, Soul of Elements: 5,043 decks
Pantlaza, Sun-Favored: 4,557 decks
Voja, Jaws of the Conclave: 4,535 decks
Fynn, the Fangbearer: 4,250 decks

Often played with Guardian Project

Cards that show up in the same decks on EDHREC.

Rulings

2019-01-25: A face-down creature has no name, so it can't share a name with anything. This includes other creatures with no name.
2019-01-25: Whether the entering creature shares a name with a creature you control or a creature card in your graveyard is checked both as that creature enters and as Guardian Project's ability resolves. If the entering creature isn't the first of its name as it enters, the ability doesn't trigger at all; if its name is shared as the ability resolves, you don't draw a card.
2019-01-25: If the entering creature leaves the battlefield and returns while Guardian Project's ability is on the stack, that same card will be a new creature you control that shares a name with the creature that was on the battlefield, so you won't draw a card. However, Guardian Project's ability may trigger for the new creature and you may draw a card as that ability resolves.
2019-01-25: If the entering creature is put into your graveyard while Guardian Project's ability is on the stack, that same card will be a creature card in your graveyard that shares a name with the creature that was on the battlefield, so you won't draw a card.