Cheap artifacts with death triggers or refund abilities maximise Repurposing Bays efficiency
Apart from the 6 basic lands, a Commander deck may not contain double cards and in the choice of cards for the deck you are also limited to the colors of your Commander
Playtesting helps identify the most effective combinations in your deck
If you really want to know more about Paulo, he even summarized the path of his Magic career for you in three parts
Getting the angle of the sword right, and all those intricate runes correct, was very time consuming
The triggered ability goes on the stack before the spell resolves, and there is free timing before the spell resolves, so if you are triggering this with a combat trick that has an untap effect, don't forget to fire one off before the spell