Watcher of the Spheres 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
Flying Creature spells with flying you cast costless to cast. Whenever another creature you control with flying enters, this creature gets +1/+1 until end of turn.
Complete guide
Watcher of the Spheres is a cornerstone for any deck focused on the skies, acting as both a powerful ramp engine and a growing threat. This Bird Wizard rewards you for populating your board with winged allies by making them cheaper to play and gaining strength from their arrival.
Cost Reduction Mechanics
Watcher of the Spheres reduces the cost of creature spells with flying you cast by {1}. This reduction only applies to the generic mana portion of a spell's cost. For example, if a spell costs {1}{W}, it will cost {W} while this creature is on the battlefield. Note that the spell must actually have the flying keyword while it is on the stack; an ability that gives a creature flying only once it enters the battlefield will not trigger this discount.
Scaling Power
Every time another creature with flying enters the battlefield under your control, Watcher of the Spheres receives a +1/+1 buff until the end of the turn. This ability triggers regardless of whether the creature was cast or put onto the battlefield through other means. Since it is a triggered ability, it uses the stack and can be responded to before the bonus is applied.
Common Mistakes to Avoid
A common error is confusing total cost with mana value. Even if Watcher of the Spheres reduces the amount of mana you spend, the mana value (formerly converted mana cost) of the spell remains the same. Additionally, remember that the +1/+1 bonus is temporary; it wears off during the cleanup step of the turn the creature entered.
Interaction examples
Ornithopter of ParadiseWith Watcher of the Spheres on the battlefield, you look to cast Ornithopter of Paradise. Since Ornithopter of Paradise is a creature spell with flying and has a mana cost of {2}, the cost reduction applies. You only pay {1} to cast it. When the Ornithopter enters the battlefield, Watcher of the Spheres' second ability triggers, giving it +1/+1 until end of turn.
Esper SentinelIf you cast Esper Sentinel while Watcher of the Spheres is in play, you must pay its full cost of {W}. Because Esper Sentinel does not have flying, it does not receive a discount. Furthermore, when Esper Sentinel enters the battlefield, it will not trigger the +1/+1 bonus for Watcher of the Spheres for the same reason.
Guide written with AI from the official text and rulings. Official English text prevails.
How it works : Watcher of the Spheres
Original English text — Wizards of the Coast / Scryfall
- #1· Wizards of the Coast
To determine the total cost of a spell, start with the mana cost or alternative cost you're paying, add any cost increases, then apply any cost reductions (such as that of Watcher of the Spheres). The mana value of the spell remains unchanged, no matter what the total cost to cast it was.
No other card is named in this ruling.
- #2· Wizards of the Coast
The cost reduction applies only to generic mana in the cost of creature spells with flying you cast. For example, if you cast a second Watcher of the Spheres, its cost won't be reduced below
.No other card is named in this ruling.
- #3· Wizards of the Coast
A creature spell that doesn't have flying won't cost less even if an effect will cause the creature to have flying once on the battlefield. This is also true if the creature spell itself has an ability that gives it flying once on the battlefield under certain conditions, even if those conditions are true.
No other card is named in this ruling.
Legal formats
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Meta decks with Watcher of the Spheres
No archived Top 8 deck with this card yet.