I could maybe see this being played as a two-of in the 4- and 5-colorc control decks in Modern, and it may even break into the multicolored decks in Pioneer as well
Japan optimises for craftsmanship
For each generic mana in that cost, you may tap an untapped artifact or creature you control rather than pay that mana." If a waterbend cost is part of the total cost to cast a spell or activate an ability, you may tap an untapped artifact or creature you control rather than pay one generic mana in that total cost any number of times up to a maximum of the amount of generic mana in the waterbend component of that total cost
But if you'd rather get straight into a battle and learn as you go, skip straight past to 'How to set up a game'
Let's say you spent a relatively conservative (based on the number of hours I've spent playing Civilization ) 40 hours playing each game
Hardened Tactician Hardened Tactician, besides having a good body, can sac tokens at will and cash them in for cards, provided you have the mana