As Circle of Affliction enters the battlefield, choose a color.

Whenever a source of the chosen color deals damage to you, you may pay . If you do, target player loses 1 life and you gain 1 life.

, Sacrifice a creature: The next time a source of your choice would deal damage to any target this turn, prevent that damage.

Vigilance

Formidable — : Add . Activate only if creatures you control have total power 8 or greater.

As Circle of Protection: Art enters the battlefield, choose an artist.

: The next time a source of your choice with art by the chosen artist would deal damage to you this turn, prevent that damage.

: Return Circle of Protection: Art to its owner's hand.

: The next time a black source of your choice would deal damage to you this turn, prevent that damage.

: The next time a green source of your choice would deal damage to you this turn, prevent that damage.

: The next time a creature of your choice with shadow would deal damage to you this turn, prevent that damage.

As Circle of Solace enters the battlefield, choose a creature type.

: The next time a creature of the chosen type would deal damage to you this turn, prevent that damage.

Bear Form — As long as it's your turn, Circle of the Moon Druid is a Bear with base power and toughness 4/2. (It loses all other creature types.)

Cumulative upkeep (At the beginning of your upkeep, put an age counter on this permanent, then sacrifice it unless you pay its upkeep cost for each age counter on it.)

As Prismatic Circle enters the battlefield, choose a color.

: The next time a source of your choice of the chosen color would deal damage to you this turn, prevent that damage.

As Story Circle enters the battlefield, choose a color.

: The next time a source of your choice of the chosen color would deal damage to you this turn, prevent that damage.

This spell costs less to cast for each Knight you control.

Creatures you control get +1/+1.

Whenever you cast a legendary spell, create a 2/2 white Knight creature token with vigilance.

, : Create a 2/2 white Knight creature token with vigilance.