The rest are about stopping certain decks from taking over, leading to a boring and expensive meta
Shadow helps to refill your hand if any of those creatures die again, keeping the engine going
Enchantment Color tag templates(None) Underworld Breach Each nonland card in your graveyard has escape
The front ETB puts permanent cards from your graveyard into your hand and the back puts permanent cards from your hand onto the battlefield
It's very easy to build around, just mono-Green ramp with extra mana payoffs like X spells such as Hydra like Benevolent Hydra that you can just brake after this arrives
That was until Pro Tour Champion, Greg Orange, 5-0d a Legacy League on Magic Online with a Humans deck featuring Rick, Steadfast Leader, Michonne, Ruthless Survivor, Daryl, Hunter of Walkers, and Negan, the Cold-Blooded