The cost-reduction ability of Johann's Stopgap doesn't change its mana cost or mana value, only the total cost you pay
It fits the character perfectly, it balances the cards power level and casting costs pretty well, and it can ultimately be broken in really absurd ways
Mana Crypt Mana Crypt is like Sol Ring but faster and costs zero mana to play, though youd have to win a coin flip every turn or take three damage
Memnarch A Darksteel legend and an important part of Mirrodins lore, Memnarch is a cool commander to build a deck around
Sure, he or she may have spent one on this Soul, but now you have three more creatures to follow up with
9 Far Wanderings Far Wanderings is not that hot in the early game, but its amazing in the middle or late