Horizon of Progress's first ability checks the effects of all mana-producing abilities of lands you control, but it doesn't check their costs or legality
Keening Stone does the same, although it's significantly more expensive to play
His equipment mirrors the Materia and weapon upgrading system of the game while still playing inside MTG rules, and the bonus he gets from allied creatures' equipment reflects the importance of keeping your party well-stocked and ready for battle as well
Top-notch commanders for a cascade deck are Yidris, Maelstrom Wielder, Faldorn, Dread Wolf Herald, Maelstrom Wanderer, and Averna, the Chaos Bloom
You usually cant barter or negotiate, since buylist prices are often firm
Two-Handed Axe Two-Handed Axe works really well in Boros equipment builds, especially when you can attach it to creatures without having to pay full cost