Activate a creature by tapping it, adding at least {G}.
Activate Questing Phelddagrif's first ability by paying {G}, causing an opponent to create a 1/1 Hippo creature token.
When the Hippo enters the battlefield, Intruder Alarm triggers, untapping all creatures.
Repeat.

Infinite mana creatures you control can produce

Infinite untap of all creatures

Infinite creature tokens for any number of opponents

Infinite ETB for any number of opponents

Questing Phelddagrif

Intruder Alarm

Activate the mana-producing creature by tapping it, adding at least {G}.
Activate Questing Phelddagrif's first ability by paying {G}, giving it +1/+1 until end of turn and causing target opponent to create a 11 Hippo creature token.
The Hippo enters the battlefield, triggering Intruder Alarm and Suture Priest's second ability.
Resolve the Intruder Alarm trigger, untapping all creatures.
Resolve the Suture Priest trigger, causing the Hippo token's controller to lose 1 life.
Repeat.

Infinite creature tokens for opponents

Infinite ETB for opponents

Infinite lifeloss

Infinitely large Questing Phelddagrif until end of turn

Suture Priest

Cast Crafty Cutpurse by paying {3}{U}.
Crafty Cutpurse enters the battlefield, causing all tokens that would be created under an opponent's control this turn to be created under your control instead.
Activate Questing Phelddagrif's first ability by paying {G}, causing Questing Phelddagrif to get +1/+1 until end of turn and creating a 1/1 Hippo creature token.
Activate Phyrexian Altar by sacrificing the Hippo token, adding {G}.
Repeat from step 3.

Infinite death triggers

Infinite ETB

Infinite LTB

Infinite sacrifice triggers

Crafty Cutpurse

Phyrexian Altar

Activate Questing Phelddagrif by tapping it, adding {G}.
Market Festival triggers, adding two mana of any color(s).
Activate Questing Phelddagrif's first ability by paying {G}, 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} and putting a -1/-1 counter on it, untapping it.
Repeat.
Once you have infinite mana, you may activate Questing Phelddagrif's third ability to cause any number of opponent to draw infinite cards.

Infinite card draw for any number of opponents

Infinite colored mana

Infinite draw triggers for any number of opponents

Infinite lifeloss for any number of opponents

Sinking Feeling

Ashaya, Soul of the Wild

Market Festival

Activate Questing Phelddagrif by tapping it, adding {G}{G}.
Activate Questing Phelddagrif's first ability by paying {G}, 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} and putting a -1/-1 counter on it, untapping it.
Repeat.

New Horizons

Combos with "Questing Phelddagrif"