The "legend rule" is the rule that states that if a player controls two or more legendary permanents with the same name, that player chooses one of them, and the rest are put into their owners' graveyards
(2020-08-07) If a melded permanent or a merged permanent is exiled by Duplicant's triggered ability, that ability's controller chooses the relative timestamp of the exiled cards
This was changed in Kaldheim to make white more competitive in Commander
Those decks are rather inconsistent and vulnerable to disruption, though
Enchantment - Saga Bleeding Effect At the beginning of combat on your turn, creatures you control gain flying until end of turn if a creature card in your graveyard has flying
25-21) Doubling Season ($25), Woodfall Primus ($10), Mana Reflection ($10), Genesis ($15), Regal Force ($8) Im lumping these cards together because they often end up in the same kinds of Commander decks: big, green, angry brews that overwhelm opponents with mana ramp, tokens, fat, and utility