Cycling

MTG Mechanic

Cycling is great on situational cards like Lightshield Parry that have situationally useful effects, but if the right situation doesn't come up—say you need a creature and not a combat trick—you can dig for the card you need. Additionally, some cards have abilities that trigger when you cycle them, or when you discard other cards, so keep those cards flowing! No one wins a race when they're out of gas.