Convoy mode is a 2 faction deck alternate format of Altered TCG, where the theme is members of 1 faction joining a different faction to lend a hand on an expedition in the Tumult.
2 Factions allowed in 1 deck
1 “Main” faction that matches your hero
1 “Aid” faction that is different
Same deck building limits as Standard
39 non-hero cards + 1 hero card min
Max 3 copies of the same named card
15 rare max
3 Unique max
Aid faction may include 10 Common cards, 5 rares, and 1 unique
Remainder of the cards have to be your main faction and match your hero
Example of Convoy deck.