cards like balance mtg Similar to Single Combat (foil) you may cast that card without paying its mana cost if the two spells have the same mana value. Balance | Fourth Edition Foreign

Any deck that has anything to do with artifacts is going to want this, as well as any strategies just doing things with Treasure tokens (or even just tokens in general)

While you can use it as ramp in an artifact creature heavy deck, it can turn into a hidden win condition with the right cards

Dual Lands $6,500 $25,000 Underground Sea $25,000 Tundra $20,000 Tropical Island $13,600 Bayou $9,300 Taiga $8,000 Plateau $7,500 Scrublands $7,000 Savannah $6,500 Badlands $5,920 Like the Moxes, the Dual Lands (so called for being 2 basic land types combined) are hugely powerful now

Like Krosan Tusker, this is a creature you rarely hard-cast