Sphere of Annihilation enters the battlefield with X void counters on it.

At the beginning of your upkeep, exile Sphere of Annihilation, all creatures and planeswalkers with mana value less than or equal to the number of void counters on it, and all creature and planeswalker cards in graveyards with mana value less than or equal to the number of void counters on it.

If a black source would deal damage to you, prevent 2 of that damage.

If an artifact would deal damage to you, prevent 1 of that damage.

Spells cost more to cast.

Sphere of the Suns enters the battlefield tapped and with three charge counters on it.

, Remove a charge counter from Sphere of the Suns: Add one mana of any color.

Flying

Creature spells with flying you cast cost less to cast.

Whenever another creature with flying enters the battlefield under your control, Watcher of the Spheres gets +1/+1 until end of turn.