Card

Brion Stoutarm

Mana cost {2}{R}{W}

Lifelink {R}, {T}, Sacrifice another creature: Brion Stoutarm deals damage equal to the sacrificed creature's power to target player or planeswalker.

Part of 13 known combos, 4 of them two-card. 1 official ruling.

Bracket

B1 Exhibition — Not in the same deck as its two-card combo partners: Serra Avatar, Soul of Eternity, Enduring Angel // Angelic Enforcer, Body of Research
B2 Core — Not in the same deck as its two-card combo partners: Serra Avatar, Soul of Eternity, Enduring Angel // Angelic Enforcer, Body of Research
B3 Upgraded — Not in the same deck as its early two-card combo partners: Serra Avatar, Soul of Eternity, Enduring Angel // Angelic Enforcer
B4 Optimized — allowed: No restriction beyond the banned list
B5 cEDH — allowed: No restriction beyond the banned list

Two-card combo with Serra Avatar, Soul of Eternity, Enduring Angel // Angelic Enforcer, Body of Research (early with Serra Avatar, Soul of Eternity, Enduring Angel // Angelic Enforcer)

Bracket: Lotus Vault analysis, with Commander Spellbook flags

13 known combos, 4 of them two-card.

Brion Stoutarm + Serra Avatar
Produces: Near-infinite damage to one opponent, Near-infinite lifegain, Target opponent loses the game
View on Commander Spellbook
Brion Stoutarm + Soul of Eternity
Produces: Near-infinite damage to one opponent, Near-infinite lifegain, Target opponent loses the game
View on Commander Spellbook
Brion Stoutarm + Malignus + Gisela, Blade of Goldnight
Produces: Near-infinite damage to one opponent, Near-infinite lifegain, Target opponent loses the game
View on Commander Spellbook

2018-03-16 · Wizards of the Coast
If Brion Stoutarm leaves the battlefield after its ability has been activated but before it resolves, the game uses its last known information to determine that it had lifelink and you'll gain life for the damage it deals.

Rulings: Scryfall · Wizards of the Coast