Its full type line in the command zone is Legendary Creature Planeswalker Insect Grist, which allows it to be your commander
If a creature with persist that has +1/+1 counters on it receives enough -1/-1 counters to cause it to be destroyed by lethal damage or put into its owner's graveyard for having 0 or less toughness, persist won't trigger and the card won't return to the battlefield
It is a one-mana legendary monkey pirate creature at 2/2 that, when it deals combat damage to an opposing player, creates a treasure token and exiles the top card of the defending player's library, and you can cast that card until the end of the turn
They are definitely good enough to use, and as you'll see later, once sleeved the differences are even less pronounced
Last March of the Ents Expensive sorcery spells need to do something spectacular in Commander, and Last March of the Ents certainly fits the bill