Whenever one of your characters wins a challenge against an opponent, you can pay one ink to draw a card
Out of all of them, Doubling Season is going to be the most powerful, and, as you probably guessed, also the most expensive
You may download the forms located at The arbitration will be conducted by JAMS under its Streamlined Arbitration Rules and Procedures or, if applicable, its Comprehensive Arbitration Rules and Procedures, and any applicable supplemental rules including its Consumer Arbitration Standards of Minimum Fairness
Felidar Sovereign Felidar Sovereign requires you to have 40 life at the beginning of your upkeep to win, and hey, thats your starting life in EDH
Based on the latest market prices tracked on TCG Stacked, Urza, Lord High Artificer is worth about $21.95 USD for a regular copy and $210.30 USD for a foil copy