mtg satyr commander deck Wayfinder none) open.class Gallia of the Endless Dance

Mana Crypt adds to generic mana to your mana pool which is amazing for a zero mana artifact, with just the small downside of a 50/50 chance of taking 3 damage at the start of your turn

And, once it gets up to 8 charge counters, it becomes a frightening creature that makes all of your artifacts incredibly resilient

While the parts of the card are complex, with lots of information for newcomers, Gateway slows down the pace of learning, to provide time to absorb every detail

These all give you access to powerful removal, counterspell, and protection, something very much appreciated in a deck like Calvary Charge that wants a lot of creatures on the battlefield on your side and little on your opponents'

You also get counters on all of your existing creatures, which can be a big swing

Valgavoths Onslaught A lot of the Green decks I play will frequently get to 12+ lands in play