Reap and Sow is the one people have to read
This conflict came to a head with the 30th Anniversary Edition set in 2022
Most notably, Rielle states that whenever its controller discards cards for the first time each turn, they draw that many cards, allowing cards like Faithless Looting to provide incredible card advantage for a minimal cost
Krav, the Unredeemed // Regna, the Redeemer Krav, the Unredeemed and Regna, the Redeemer are an excellent commander pairing for an Orzhov deck that is fairly open-ended on how you build them, since they support Lifegain, Sacrifice, +1/+1 Counters, and even Tokens
What makes Rhys better than other doublers is that it doubles everything in play, whereas other cards only double what will come into play in the future
Were pretty familiar with event sets these days, with the most recent example being March of the Machine another set focused on a Phyrexian invasion