Clearwater Goblet is one of those cards players keep asking about. Here is, in plain words, what its official text says, the rulings published by Wizards of the Coast, and the combos players actually run.

Official card text

Sunburst (This artifact enters with a charge counter on it for each color of mana spent to cast it.) At the beginning of your upkeep, you may gain life equal to the number of charge counters on this artifact.

Complete guide

Clearwater Goblet is a versatile artifact from the Fifth Dawn expansion that rewards players for utilizing a diverse mana base. By harnessing the Sunburst mechanic, this artifact provides a consistent source of life gain every turn to help you stabilize against aggressive strategies. It acts as a resilient engine that turns your color fixing into a defensive advantage.

Understanding Sunburst

The primary strength of Clearwater Goblet lies in the Sunburst keyword. When you cast this spell, the game checks how many different colors of mana (White, Blue, Black, Red, Green) were used to pay its five-generic mana cost. It enters the battlefield with a number of charge counters equal to that number of colors. If you use five different colors, it starts with five counters; if you use only colorless mana, it enters with zero.

The Upkeep Resolution

Clearwater Goblet features a triggered ability that occurs at the start of your upkeep. This is a 'may' ability, meaning you choose whether or not to gain the life as the ability resolves. The amount of life gained is determined by the number of charge counters currently on the artifact at the moment the ability resolves. If the Goblet leaves the battlefield before the ability resolves, it uses the number of counters it had the last time it was on the battlefield.

Strategic Implementation

This card is most effective in 'Domain' or five-color decks where you can reliably cast it for four or five colors. It is important to remember that Sunburst only counts colors of mana, not the total amount of mana spent. Spending six mana to cast it will still only result in a maximum of five counters since there are only five colors in Magic. Always ensure your mana fixing is ready before committing this to the stack.

Interaction examples

Offsetting The One Ring

The One Ring

If you have The One Ring on the battlefield with three burden counters, you will lose 3 life during your upkeep. By casting Clearwater Goblet using three or more colors of mana, you can use its upkeep trigger to gain back that lost life, effectively neutralizing the Ring's downside while you continue to draw cards.

Fixing for Maximum Counters

Solemn Simulacrum

You can use Solemn Simulacrum to search your library for a basic land type you are missing, such as a Mountain or Forest. This ensures that when you later cast Clearwater Goblet, you have an additional color available to spend, increasing the number of charge counters it receives and the amount of life you gain each turn.

The Zero Counter Scenario

If you cast Clearwater Goblet using five colorless mana produced by utility lands or artifacts, the Sunburst ability will result in zero charge counters. During your upkeep, the trigger will still occur, but choosing to gain life will result in gaining 0 life.

Guide written with AI from the official text and rulings. Official English text prevails.