Calabrone della Fonderia (Foundry Hornet)
Calabrone della Fonderia 

Quando il Calabrone della Fonderia entra nel campo di battaglia, se controlli una creatura con un segnalino +1/+1, le creature controllate dai tuoi avversari prendono -1/-1 fino alla fine del turno.
Testo delle regole (Oracle, inglese)
When this creature enters, if you control a creature with a +1/+1 counter on it, creatures your opponents control get -1/-1 until end of turn.
Il suo ronzio viene facilmente confuso con quello delle ali di un tottero.
Legalità
Chiarimenti sulle regole (in inglese)
2017-02-09
The set of creatures affected by Foundry Hornet’s triggered ability is determined as the ability resolves. Creatures opponents begin to control later in the turn and permanents opponents control that become creatures later in the turn won’t get -1/-1. The effect continues until end of turn even if you stop controlling a creature with a +1/+1 counter on it.
2017-02-09
If you don’t control a creature with a +1/+1 counter as Foundry Hornet enters the battlefield, its ability doesn’t trigger, even if you can give a +1/+1 counter to a creature right away. If you control no creatures with a +1/+1 counter as the ability resolves, nothing happens.
2017-02-09
If an effect causes Foundry Hornet to enter the battlefield with a +1/+1 counter on it, it satisfies its own triggered ability.