Tengu format ruling
Magical Marionette

Card effect (current official text)Each time a Spell Card is activated, place 1 Spell Counter on this card when that Spell Card resolves. This card gains 200 ATK for each Spell Counter on it. You can remove 2 Spell Counters from this card, then target 1 monster on the field; destroy that target.
Rulings
- There is no limit to the number of Spell Counters you can have on Magical Marionette.
- Removing Spell Counters from Magical Marionette to use its effect is a cost.
- You can use Magical Marionette's effect multiple times in the same turn, as long as you have enough Spell Counters to pay the cost.
- You can destroy Magical Marionette with its own effect.
- You place a Spell Counter on this card when the Spell Card resolves, so if Magic Jammer is used to negate the Spell Card's activation then you do not place a Spell Counter on this monster. But if Imperial Order is chained to the Spell Card, you still place a Spell Counter on this monster because the activation of the Spell Card was not negated. If the Spell Card was a Continuous, Equip, or Field Spell Card, and "Dust Tornado" is chained to its activation and destroys it before it resolves you still place a Spell Counter because the activation of the card was not negated.
- If you activate a Spell Card, and your opponent chains Call of the Haunted to Special Summon Magical Marionette, Magical Marionette does not get a Spell Counter for that Spell Card because Magical Marionette must be face-up on the field when the Spell Card is activated and when it resolves in order to get a Spell Counter.
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the Tengu forum — sourced change requests get reviewed.