You attack, you gain life, and the thing you lost is back before your next turn
50 white cards 50 blue cards 50 black cards 50 red cards 50 green cards 50 multicolored cards, with five of each color pair 30 nonbasic lands 30 colorless artifacts Artifacts are tricky because some of them either have a colored activation cost or reference a certain color
Phyrexian Arena looks like it will be the business, but its no match for blue's best enchantment, Rhystic Study
Its Channel ability is extremely strong because it is an activated ability, not a spell that means it is almost uncounterable by counterspells, and it can play through stax pieces like Eidolon of Rhetoric or Rule of Law
Could eventually suffer the same fate of The Heart of Magic and become outdated over time
Do you attack a lot with your Commander