Cargo is the Wincon

Mirror all phoenixes; Sunken Tower all phoenixes; PHOENIX ARMY, ATTACK!

Your phoenixes will lose Reckless when they become relics again, and won't be affected by Sunken Tower's stun the following turn, allowing you to reactivate and Charge with few considerations.

Some iteration of this deck may be worth considering in relic weapon or slow removal-heavy metas if you include more face aegis (plenty to be had in these colors) because you can hide all of your Charge units behind a single face aegis on your opponent's turn.

Xo is here because all of your merchants should be able to cycle it in and out of the market, but I'm honestly not convinced Deepforged Plate wouldn't be a better option here.