Watcher of the Spheres

one white mana one blue mana Creature — Bird WizardPower and toughness2/2

Flying

Creature spells with flying you cast cost one generic mana less to cast.

Whenever another creature you control with flying enters, this creature gets +1/+1 until end of turn.

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Showing Core Set 2021#227

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0.56 $

Foil 6.10 $

11 printings

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Watcher of the Spheres rulings

2020-06-23
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.
2020-06-23
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 .
2020-06-23
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.

Watcher of the Spheres keyword rules

Flying Rule 702.9

Flying is an evasion ability.

A creature with flying can’t be blocked except by creatures with flying and/or reach. A creature with flying can block a creature with or without flying. (See rule , “Declare Blockers Step,” and rule , “Reach.”)

Multiple instances of flying on the same creature are redundant.