This cycle of lands from Scars of Mirrodin and Kaladesh is perfect for those decks
This can play into one of Human's other gameplans, allowing Katilda, Dawnhart Prime to spread +1/+1 counters across all of your creatures
It's great in sacrifice decks that want a cheap creature to sacrifice and recur over and over, but midrange decks can also use it as a sticky threat that scales well into the late game thanks to kicker
Abzans new cards are weaker overall than many of the others I feel
It's one of the most broken spells in multiplayer ever printed, although it has a bit of a brake on it to keep it from really being broken
While there are a wide variety of dragons that are potent by themselves, within the Commander format, many decks aim to defeat their opponents through the use of several dragons and synergistic cards that help tie them together