It's not really big enough to be really big and it's still plenty expensive, the ability to dump it out yet again is nice value if you have absolute tons of colorless mana and nothing to do with it
Well, Gilgamesh, MasteratArms is here to dig deep
Its perfect for players who love action-packed games and want to overwhelm opponents before they can recover
As such, as a new Commander player, I would probably value the lands from Open Hostility more than the lands from Stalwart Unity, even though the Stalwart Unity lands have slightly more value
That said, Call for Backup only has three reprints worth $2+, including the big-ticket Kalonian Hydra, with Strionic Resonator and Flameshadow Conjuring both just over $2
Shes also just good for any deck that wants to be playing a lot of Green Creatures and can generate a lot of mana