My gut read is that Out of the Tombs is pretty firmly in the more cool than good space for most Cubes, but thats a totally fine sort of card to get excited about
For example, if Sidisi enters the battlefield and you put three creature cards into your graveyard, Sidisi's last ability will trigger once and you'll put one Zombie token onto the battlefield
For a Shadow the Hedgehog Commander deck, you'll be playing a ton of cards with haste as Shadow's effect plays with that alongside having a sub-Treasure theme to make all your spells unable to be interacted with
It's also good leading an Insect brew
There are all sorts of ways to go with this strategy, and every few years it becomes a little more viable in various formats as Elves rotate in and out of Standard
It leaves each player with his or her lands, one creature, one Planeswalker, one enchantment, and one artifact