Activate Questing Phelddagrif's first ability by paying ({G} magic symbol) , giving it +1/+1 until end of turn and causing an opponent to create a 1/1 Hippo creature token.
The Hippo enters the battlefield, triggering Suture Priest's second ability, causing the opponent to lose 1 life.
Activate Questing Phelddagrif by paying ({1} magic symbol) and putting a -1/-1 counter on it, untapping it.
Repeat.
Results
Infinite creature tokens for any number of opponents.