As long as equipped creature is tapped, tapped creatures you control get +2/+0.
As long as equipped creature is untapped, untapped creatures you control get +0/+2. : You may tap or untap equipped creature.
Equip
If equipped creature becomes tapped, untapped creatures you control will immediately lose the +0/+2 bonus. This may cause nonlethal damage already dealt to them that turn to become lethal. The Paruns would want you to be careful.
Random a card of Magic: The Gathering (MTG), but you can also roll the D20 dice, random a Planeswalker, have fun with the random rules and more.