This card effectively doubles the mana produced by your basic lands in a mono-colored deck
A common combo that these decks go for, is grabbing creatures that untap your pod enabler, letting you then sacrifice that creature to get another, chaining upwards until you get find some win condition
Standard, which is the format most newer players get involved with first, is generally considered the cheapest format
While its last ability is the most difficult to utilize, if five white mana is spent and fifteen tapped creatures are untapped, Halo Fountain can serve as an alternate win condition, immediately allowing its controller to win the game
Legendary Creature - Human Shaman Sepulchral Primordial Intimidate (This creature can't be blocked except by artifact creatures and/or creatures that share a color with it.) When this creature enters, for each opponent, you may put up to one target creature card from that player's graveyard onto the battlefield under your control