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Archon of Redemption's ability is a triggered ability and will not be effected by Arrest. Arrest affects activated abilities, described by rule 602.1.

602.1. Activated abilities have a cost and an effect. They are written as “[Cost]: [Effect.] [Activation instructions (if any).]”

Examples: Ancient Silverback, Elvish Mystic, Heritage Druid, Fume Spitter

Triggered abilities, like the Archon's, are described by rule 603.1.

603.1. Triggered abilities have a trigger condition and an effect. They are written as “[Trigger condition], [effect],” and begin with the word “when,” “whenever,” or “at.” They can also be as “[When/Whenever/At] [trigger event], [effect].”

Archon of Redemption's ability is a triggered ability and will not be effected by Arrest. Arrest affects activated abilities, described by rule 602.1.

602.1. Activated abilities have a cost and an effect. They are written as “[Cost]: [Effect.] [Activation instructions (if any).]”

Examples: Ancient Silverback, Elvish Mystic, Heritage Druid, Fume Spitter

Triggered abilities, like the Archon's, are described by rule 603.1.

603.1. Triggered abilities have a trigger condition and an effect. They are written as “[Trigger condition], [effect],” and begin with the word “when,” “whenever,” or “at.” They can also be as “[When/Whenever/At] [trigger event], [effect].”

In either case, whether or not mana is involved has no bearing on the classification of the ability (except in the specific case where mana is produced, but we'll ignore that for this conversation).

Activated abilities can have a mana cost (R: Shivan Dragon gets +1/+0 until end of turn) or not (T: Prodigal Sorcerer deals 1 damage to target creature or player).

Also, triggered abilities can have optional costs (Apothecary Initiate's Whenever a player casts a white spell, you may pay {1}. If you do, you gain 1 life). The Archon's triggered ability is an example of one that does not.

Archon of Redemption's ability is a triggered ability and will not be effected by Arrest. Arrest affects activated abilities, described by rule 602.1.

602.1. Activated abilities have a cost and an effect. They are written as “[Cost]: [Effect.] [Activation instructions (if any).]”

Triggered abilities, like the Archon's, are described by rule 603.1.

603.1. Triggered abilities have a trigger condition and an effect. They are written as “[Trigger condition], [effect],” and begin with the word “when,” “whenever,” or “at.” They can also be as “[When/Whenever/At] [trigger event], [effect].”

Archon of Redemption's ability is a triggered ability and will not be effected by Arrest. Arrest affects activated abilities, described by rule 602.1.

602.1. Activated abilities have a cost and an effect. They are written as “[Cost]: [Effect.] [Activation instructions (if any).]”

Examples: Ancient Silverback, Elvish Mystic, Heritage Druid, Fume Spitter

Triggered abilities, like the Archon's, are described by rule 603.1.

603.1. Triggered abilities have a trigger condition and an effect. They are written as “[Trigger condition], [effect],” and begin with the word “when,” “whenever,” or “at.” They can also be as “[When/Whenever/At] [trigger event], [effect].”

Activated abilities are in the form of cost:effect, where the cost can, but does not have to, include mana.

Archon of Redemption's ability is a triggered ability and will not be effected by Arrest.

Triggered abilities, like the Archon's, almost always begin with "When" or "Whenever".

Archon of Redemption's ability is a triggered ability and will not be effected by Arrest. Arrest affects activated abilities, described by rule 602.1.

602.1. Activated abilities have a cost and an effect. They are written as “[Cost]: [Effect.] [Activation instructions (if any).]”

Triggered abilities, like the Archon's, are described by rule 603.1.

603.1. Triggered abilities have a trigger condition and an effect. They are written as “[Trigger condition], [effect],” and begin with the word “when,” “whenever,” or “at.” They can also be as “[When/Whenever/At] [trigger event], [effect].”