Riptide

Equip {3}
At the beginning of your upkeep, put a tidal counter on Riptide.
Equipped creatures gains +X/+X, where X is the number of tidal counters on Riptide.
If equipped creature would be destroyed, you may instead remove all tidal counters from Riptide. If you do this, equipped creature gains indestructible until end of turn. Unequip Riptide.
If Riptide has a tidal counter on it, it has hexproof.