You simply choose whether or not to pay that amount of as the ability resolves
They do, however, leave you open to getting blown out through land hate like Ghost Quarter, so be careful when putting multiple Auras on one land
I think that exploring alternate resources to create a middle ground between free spells and complete dependency on mana is vital to long-term game balance
Black: Phyrexian Arena, Deadly Dispute, Black Market Connections, Nights Whisper, etc
or I will only die to Commander damage" Loxi: Realistically, this is another soul sister
THE FIRST FIVE COLOR LEGEND As far as I can find, and I may be wrong, the first five colored legend we received was from Stronghold in the form of Sliver Queen, even predating Cromat, Atogatog and Karona