Blackblade Reforged

Mana cost: {2}
Type: Legendary Artifact — Equipment
Set: Signature Spellbook: Gideon #8 (rare)
Price: $5.19 USD

Equipped creature gets +1/+1 for each land you control.
Equip legendary creature {3}
Equip {7}

Blackblade Reforged has 13 printings, first in Dominaria (2018). EDHREC ranks it #358 among Commander cards. It appears most in Cloud, Ex-SOLDIER decks (12,501 on EDHREC). 4 public decks on TCG run it. It has 2 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 Blackblade Reforged

Arm for Battle - Commander Legends, led by Wyleth, Soul of Steel
Legends' Legacy - Dominaria United, led by Dihada, Binder of Wills
Sneak Attack - Zendikar Rising Commander, led by Anowon, the Ruin Thief
Upgrades Unleashed - Neon Dynasty Commander, led by Chishiro, the Shattered Blade

Commanders that run Blackblade Reforged most

Deck counts from EDHREC.

Cloud, Ex-SOLDIER: 12,501 decks
Kotis, the Fangkeeper: 10,268 decks
Tifa Lockhart: 7,429 decks
Syr Gwyn, Hero of Ashvale: 5,714 decks
Ojer Axonil, Deepest Might // Temple of Power: 4,350 decks
Lightning, Army of One: 3,999 decks
Alexios, Deimos of Kosmos: 3,665 decks
Obeka, Splitter of Seconds: 3,602 decks

Often played with Blackblade Reforged

Cards that show up in the same decks on EDHREC.

Rulings

2018-04-27: Whether the target creature is legendary is checked only as Blackblade Reforged's first equip ability is activated and as that ability resolves. If the creature somehow becomes nonlegendary later, Blackblade Reforged remains attached to it.
2018-04-27: "Equip [quality] creature" is a variant of the equip keyword. "Equip [quality] creature [cost]" means "[Cost]: Attach this Equipment to target [quality] creature you control. Activate only as a sorcery."