Green Slime

Stony Silence and Null Rod shut off artifact abilities by standing still; this shuts one off by pouncing on it. The counter is scoped precisely: not spells, not any activated or triggered ability, but only the ones sourced from an artifact or enchantment. That narrowing is what earns the second clause. Countering an ability usually leaves the source intact, but here, if the countered ability belonged to a permanent, the permanent dies with it. So a single Green Slime answers the ability on the stack and removes the engine that produced it, folding a Stifle and a Naturalize into one flash creature. The two casting modes serve different games. Flash makes it a held-up ambush for the Sensei's Divining Top activation, the Smothering Tithe trigger, the equipped-artifact tutor you did not see coming; you keep the mana open and only commit when a target appears. Foretell pre-loads that ambush for a single green, hiding the card face-down so the board reads clean and the discount is banked ahead of the turn you need it. Both routes point at the same job: a reactive answer to the artifact-and-enchantment layer of the game that leaves a 2/2 behind when the work is done, so the tempo you spend interacting is not tempo entirely lost.