Brallin, Skyshark Rider

Bracket

• B1 Exhibition — Not in the same deck as its two-card combo partners: Curiosity, Ophidian Eye, Tandem Lookout, Keen Sense
• B2 Core — Not in the same deck as its two-card combo partners: Curiosity, Ophidian Eye, Tandem Lookout, Keen Sense
• B3 Upgraded — Not in the same deck as its early two-card combo partners: Curiosity, Ophidian Eye, Tandem Lookout, Keen Sense
• B4 Optimized — allowed: No restriction beyond the banned list
• B5 cEDH — allowed: No restriction beyond the banned list

Why

• Two-card combo with Curiosity, Ophidian Eye, Tandem Lookout, Keen Sense (early with Curiosity, Ophidian Eye, Tandem Lookout, Keen Sense)

How Lotus Vault estimates a bracket

Bracket: Lotus Vault analysis, with Commander Spellbook flags

Combos

19 known combos, 4 of them two-card.

• Brallin, Skyshark Rider + Curiosity
  Produces: Infinite card draw, Infinite draw triggers, Near-infinite +1/+1 counters on a creature
  View on Commander Spellbook
• Brallin, Skyshark Rider + Ophidian Eye
  Produces: Infinite card draw, Infinite draw triggers, Near-infinite +1/+1 counters on a creature
  View on Commander Spellbook
• Brallin, Skyshark Rider + Tandem Lookout
  Produces: Infinite card draw, Infinite draw triggers, Near-infinite +1/+1 counters on a creature
  View on Commander Spellbook

Combos: Commander Spellbook

Rulings

• 2020-04-17 · Wizards of the Coast
  If your Commander deck has two commanders, you can only include cards whose own color identities are also found in your commanders' combined color identities. If Haldan and Pako are your commanders, your deck may contain cards with blue, red, and/or green in their color identity, but not cards with white or black.
• 2020-04-17 · Wizards of the Coast
  Brallin's middle ability gives it only one +1/+1 counter each time it resolves, no matter how many opponents are dealt damage.
• 2020-04-17 · Wizards of the Coast
  Brallin's middle ability deals 1 damage to each opponent even if you can't put a +1/+1 counter on Brallin, most likely because Brallin has left the battlefield.
• 2020-04-17 · Wizards of the Coast
  Once the game begins, your two commanders are tracked separately. If you cast one, you won't have to pay an additional {2} the first time you cast the other. A player loses the game after having been dealt 21 damage from one of them, not from both of them combined. Command Beacon's effect puts one into your hand from the command zone, not both.
• 2020-04-17 · Wizards of the Coast
  A creature with a "partner with" ability can't partner with any creature other than its designated partner. Losing a partner ability during the game doesn't cause either to cease to be your commander.
• 2020-04-17 · Wizards of the Coast
  If you discard a card as a cost to cast a spell or activate an ability, Brallin's middle ability resolves before that spell or ability but after you've chosen targets for it. If you discard a card while a spell or ability is resolving, that spell or ability finishes resolving before Brallin's triggered ability does.'
• 2020-04-17 · Wizards of the Coast
  Note that the target player searches their library (which may be affected by effects such as that of Stranglehold) and that the card they find is revealed, even though these words aren't included in the ability's reminder text.
• 2020-04-17 · Wizards of the Coast
  "Partner with [name]" represents two abilities. The first is a triggered ability: "When this permanent enters the battlefield, target player may search their library for a card named [name], reveal it, put it into their hand, then shuffle their library."
• 2020-04-17 · Wizards of the Coast
  Both commanders start in the command zone, and the remaining 98 cards of your deck are shuffled to become your library.
• 2020-04-17 · Wizards of the Coast
  The triggered ability of the "partner with" keyword still triggers in a Commander game. If your other commander has somehow ended up in your library, you can find it. You can also target another player who might have that card in their library.
• 2020-04-17 · Wizards of the Coast
  The second ability represented by the "partner with [name]" keyword modifies the rules for deck construction in the Commander variant and has no function outside of that variant. If a legendary creature card with "partner with [name]" is designated as your commander, the named legendary creature card can also be designated as your commander.

Rulings: Scryfall · Wizards of the Coast