Artsip Ring

Hexproof, Indestructible.
{3}: Attach to target legendary creature or planeswalker.
Enchanted creature has Indestructible and "Cumulative upkeep -This creature gains +6/-6".
Enchanted planeswalker can use an extra
Loyalty ability per turn, but it can't gain Loyalty counters unless it's a Bausek Planeswalker.