That wasn't something that normally happened, so Matt and I talked to several employees that dropped after one round
The first activation resolves, making the Amplimancer a 4/4
The Angel Advisor has flying, vigilance, lifelink and haste all powerful abilities and its main ability allows players to pass the card (and its control) to others during each postcombat main phase
On its surface, Stoneforge has all the problems of famous mistakes like Tinkerit tutors and circumvents mana costs, two dangerous abilities that get even more dangerous when combined
Thats because this two-mana artifact is begging people to sign it, giving the card a page counter on it for each person thats done so
If you manage to set this trigger off twice in a turn, youre treated to two cards yourself