Goldspan Dragon Boros is notoriously bad at ramping, so getting to your more expensive spells can be a struggle
Whenever you cast a noncreature spell with mana value 3 or greater, draw a card
Specifically, if you are running a sacrifice commander, such as Korvold, Fae-Cursed King who grows stronger with each sacrifice
UnOrthodox suppliment: Legal Card Name: Drizzt DoUrden Mana Cost: Converted Mana Cost: 4 Types: Legendary Creature Elf Warrior Rules Text: First Strike, Bands with Cats (This creature can attack in a band with any number of Cat creatures you control
Prices for rare cards can hit hundreds, if not thousands, of dollars
I find Rosewaters work to be an invaluable resource for Cube designers