mtg 20 card deck Secret Lair Commander Deck: Ways to Win its owner loses the game. MTG - Magic 2013 Booster

This is Elfball, a strategy where your army is your mana

15 Bedecked Brokers (Streets Of New Capenna) With a focus on putting a wide variety of counters on creatures you control, Bedecked Brokers buffs your team while making them more imposing over time

(Choose any number of permanents and/or players, then give each another counter of each kind already there.) Whenever a player casts their second spell each turn, proliferate

As an added plus, adding these to a Boros deck will be a nice brag

First, Galvanic Relay makes you play the exiled cards on your next turn, not the current turn, so youll be slightly less pressed for mana