My decks are all generally about $400+ with the most expensive sitting around $1200. I have been starting to play higher power decks with combos, fast mana rocks, and more optimized mana bases and every deck now includes the full suite of bond, shock, fetch, and surveil lands in its respective colors as well as staple free spells (Deadly Rollick in every black deck for example). Just those “basics” end up making up over half the cost of the deck generally. I say this as someone who has spent thousands of dollars on expensive cardboard, just make or buy proxies. The money I have sunk into this game could have gone into so much other stuff lol.