The enchantment gives every nonland card in your graveyard the escape mechanic, meaning you can recast them by paying their normal mana cost plus exiling three other cards from your graveyard as an additional cost
9 Animar, Soul of Elements An incredibly powerful commander in its own right, the only reason Animar, Soul of Elements, isn't higher on this list is due to the numerous colors in Animar's casting cost meaning that not all hypothetical hydra decks will be able to run Animar
It's somewhat mana greedy but once it spools up its very hard to deal with
You also have Under the Sea which is a powerful counter to aggro decks and The Muses
Creature - Beast Color tag templates(None) Regna, the Redeemer Partner with Krav, the Unredeemed (When this creature enters, target player may put Krav into their hand from their library, then shuffle.) Flying At the beginning of each end step, if your team gained life this turn, create two 1/1 white Warrior creature tokens