Florian, Voldaren Scion

Mana cost: {1}{B}{R}
Type: Legendary Creature — Vampire Noble
Power / toughness: 3 / 3
Set: Innistrad: Midnight Hunt #223 (rare)
Price: $0.34 USD

First strike
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, Voldaren Scion has 6 printings, first in Innistrad: Midnight Hunt (2021). EDHREC ranks it #3,677 among Commander cards. It appears most in Edgar Markov decks (10,341 on EDHREC). 1 public deck on TCG runs it. It has 7 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 Florian, Voldaren Scion

Endless Punishment - Duskmourn: House of Horror Commander, led by Valgavoth, Harrower of Souls

Commanders that run Florian, Voldaren Scion most

Deck counts from EDHREC.

Edgar Markov: 10,341 decks
Valgavoth, Harrower of Souls: 5,655 decks
Rakdos, Lord of Riots: 4,416 decks
Strefan, Maurer Progenitor: 3,645 decks
Prosper, Tome-Bound: 1,991 decks
The Lord of Pain: 1,684 decks
Abaddon the Despoiler: 1,478 decks
Evelyn, the Covetous: 1,197 decks

Often played with Florian, Voldaren Scion

Cards that show up in the same decks on EDHREC.

Rulings

2021-09-24: If an opponent loses life but Florian leaves the battlefield before your postcombat main phase begins, its last ability doesn't trigger.
2021-09-24: You get a postcombat main phase even if no creatures attacked during a turn. Florian's last ability will trigger.
2021-09-24: You must pay all costs and follow all timing rules for cards you play with Florian's last ability.
2021-09-24: Damage dealt to a player causes that player to lose that much life.
2021-09-24: If an opponent loses life and subsequently loses the game before your postcombat main phase, Florian's last ability counts that loss of life.
2021-09-24: If you somehow have more than two main phases in a turn, each main phase after your first one is a postcombat main phase, and Florian's last ability triggers at the beginning of each of them.
2021-09-24: Florian's ability checks only how much life opponents lost during the turn, not by how much their life totals decreased compared to the start of the turn. For example, if an opponent lost 2 life and then gained 8 life before Florian's ability resolves, you'll look at the top two cards of your library.