At the beginning of each of your postcombat main phases, look at the top X cards of your library, where X is the total amount of life your opponents lost this turn. Exile one of those cards and put the rest on the bottom of your library in a random order. You may play the exiled card this turn.
Florian turns incidental life loss into card advantage every turn—deal damage or drain life, then dig deep and exile a card to play that turn. You build a wide aggressive board or a steady drain engine, snowball card advantage, and grind opponents out while pressuring life totals.
Repeatable card advantage that scales with how much life opponents lose
Cheap, evasive-ish commander with first strike that pressures the board early
Rewards aggression that BR already wants to do anyway
Can dig past your own card disadvantage in long games
Advantage is zero if no opponent loses life on your turn
Exiled card is lost if you don't play it that turn—no banking value
No built-in evasion beyond first strike, easy to chump or remove
BR lacks ramp/fixing, so deep digs can hit cards you can't cast
Lets attackers connect safely while still triggering combat damage.
Add efficient drain and lifegain payoffs (Vito, Sanguine Bond, Exquisite Blood) for both X-fuel and combo kills, then improve mana with fast rocks (Sol Ring, Arcane Signet) and BR fixing. Prioritize evasive or recursive threats and cheap interaction so you keep dealing damage every turn, and consider Bolas's Citadel and cost reducers to actually deploy the cards Florian exiles.