Along with being in the best colors for a lands deck, blue and green
Instead of picking one card out of each pack, you choose two cards out of each pack and pick them at the same time
Preordain Lovely little card, see two or three cards, draw one you want now and more likely one you want next turn
For example, at the beginning of my upkeep, I can put a charge counter on [c]Aether Vial[/c]
They often have abilities that reward attacking alone, bolster their strength in one-on-one combat, or provide bonuses for blocking, making them well-suited for decks that focus on precise, controlled aggression and strong battlefield presence
Ive played games with this where Ive had control of three Sol Rings (one day Ill get all four)