and how it, specifically, could give rise to two-for-one opportunities
In it, we received a bunch of Magic: The Gathering cards two copies of Teferi, Hero of Dominaria, two foil copies of History of Benalia, a Gaea's Cradle, a few original Revised dual lands, and a Mox Diamond from the From the Vaults: Relics release
It was a slow process getting the investment ready and digging far enough into the game to have the cards to spare but if a deck had no use for excess mana this was still a highly effective endgame especially for decks that used Thawing Glaciers
It had the transformation flavor using threshold, but the overall flavor beyond that was weak
The maximum number of colors of mana you can spend to cast a spell is five
Tokens that aren't a copy of something else don't have a mana cost