Immolation Shaman

Whenever an opponent activates an ability of an artifact, creature, or land that isn't a mana ability, Immolation Shaman deals 1 damage to that player.
{3}{R}{R}: Immolation Shaman gets +3/+3 and gains menace until end of turn.

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Ravnica Allegiance

Activated abilities contain a colon. They’re generally written “[Cost]: [Effect].” Some keyword abilities are activated abilities and will have colons in their reminder text (such as equip does). An activated mana ability is one that produces mana as it resolves, not one that costs mana to activate.

Activating Immolation Shaman’s second ability after one creature has blocked it won’t cause Immolation Shaman to become unblocked.

Immolation Shaman’s first ability doesn’t trigger when an opponent activates an ability of a card in hand (such as cycling) or a card in a graveyard (such as that of Bone Dragon), even if that causes a card to be put onto the battlefield.

Immolation Shaman’s first ability resolves before the ability that caused it to trigger.