Crackdown Construct

Oracle Text
Whenever you activate an ability of an artifact or creature that isn't a mana ability, Crackdown Construct gets +1/+1 until end of turn.
Card Rulings
2/9/2017 Activated abilities are written in the form “Cost: Effect.” Some keyword abilities, such as equip and crew, are activated abilities and will have colons in their reminder texts.
2/9/2017 An activated mana ability is one that adds mana to a player’s mana pool as it resolves, doesn’t have a target, and isn’t a loyalty ability.
2/9/2017 Crackdown Construct’s ability doesn’t trigger if you activate an ability of an artifact or creature card not on the battlefield.
2/9/2017 An ability whose cost is simply can be activated as many times as you’d like. Each activation causes Crackdown Construct’s ability to trigger.
Wandering Fumarole is in Standard right now, Ceaseless Searblades isn't. I don't think that this combo is strong enough for Modern, but it could have legs in Standard.
For example, Basalt Monolith doesn't trigger on the first ability, but would on the second one.