One way to do multicolor cards is to find an overlap between the two colors and push the power of the cards with the idea that if you spend both colors that can do the effect, you get something stronger than any one color could get
6 Xerneas EX: XY Base Set (Ultra Rare) $3.26 A Colorful Start We start with humble beginnings, as the Xerneas EX from the XY Base Set claims its place among the most expensive Xerneas cards in the Pokemon TCG
If this hulking dragon is on the board at your end step, and your total creature toughness is above ten, you draw a card
If you have an optimal opening hand, you can drop an Ancient Tomb, get two generic mana, drop a Sol Ring, giving you three generic mana, and drop practically any other mana rock or spell you might want for three mana
QPMNs algorithmic randomization ensures that your "Ultra Rares" are distributed mathematically