Equipped creature has lifelink.
As long as you have 30 or more life, equipped creature gets +5/+5 and has indestructible and “Prevent all damage that would be dealt to this creature.”
Equip
It can be a key, a weapon, and a way to attain great power.
If the equipped creature is dealt damage at the same time that you gain life (most likely because it dealt combat damage to a creature blocking or blocked by it) and your life total becomes 30 or greater as a result, the damage won’t be prevented. However, the equipped creature will have indestructible before state-based actions are checked, so it won’t be destroyed even if that damage would ordinarily be lethal.
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.