Great Oak Guardian Combos
Kiki-Jiki, Mirror Breaker + Great Oak Guardian
Elvish Piper + Great Oak Guardian + Vedalken Mastermind
Combo result
Infinite mana creatures you control can produce. Infinitely large creatures until end of turn. Infinite ETB. Infinite LTB. Infinite untap of creatures you control.
Prerequisites
Great Oak Guardian in hand. All other permanents on the battlefield. Creatures you control can tap to produce at least {G}{U}. Vedalkan Mastermind and Elvish Piper do not have summoning sickness.
Felhide Spiritbinder + Great Oak Guardian + Fire Whip
Combo result
Infinite damage. Infinite creature tokens with haste. Infinite mana creatures you control can produce. Infinitely large creatures until end of turn. Infinite ETB. Infinite untap of creatures you control.
Prerequisites
Great Oak Guardian in hand. All other permanents on the battlefield. Fire Whip attached to Felhide Spiritbender. Felhide Spiritbender does not have summoning sickness. Creatures you control can tap to produce at least {R}. {G} available.
Great Oak Guardian + Pulsemage Advocate + Altar of Dementia
Combo result
Infinitely large creatures until end of turn. Infinite ETB. Infinite LTB. Infinite death triggers. Infinite sacrifice triggers. Infinite card draw for opponents. Infinite untap of creatures you control.
Prerequisites
All permanents on the battlefield. Pulsemage Advocate does not have summoning sickness.
Livio, Oathsworn Sentinel + Great Whale + Great Oak Guardian
Combo result
Infinite mana lands you control can produce. Infinitely large creatures until end of turn. Infinite ETB. Infinite LTB. Infinite blinking. Infinite untap of creatures you control.
Prerequisites
All permanents on the battlefield. Livio does not have summoning sickness. You control up to seven lands that can tap to produce at least {W}{W}{W}.
Livio, Oathsworn Sentinel + Palinchron + Great Oak Guardian
Combo result
Infinite mana lands you control can produce. Infinitely large creatures until end of turn. Infinite ETB. Infinite LTB. Infinite blinking. Infinite untap of creatures you control.
Prerequisites
All permanents on the battlefield. Livio does not have summoning sickness. You control up to seven lands that can tap to produce at least {W}{W}{W}.
Mike, the Dungeon Master + Ashnod's Altar + Great Oak Guardian
Othelm, Sigardian Outcast + Ashnod's Altar + Great Oak Guardian
Sneak Attack + Great Oak Guardian + Tradewind Rider
Combo result
Infinite mana creatures you control can produce. Infinitely large creatures until end of turn. Infinite ETB. Infinite LTB. Infinite untap of creatures you control.
Prerequisites
Great Oak Guardian in hand. All other permanents on the battlefield. Creatures you control can tap to produce at least {R}. You control at least one additional creature. Tradewind Rider does not have summoning sickness.
Sneak Attack + Great Oak Guardian + Vedalken Mastermind
Combo result
Infinite mana creatures you control can produce. Infinitely large creatures until end of turn. Infinite ETB. Infinite LTB. Infinite untap of creatures you control.
Prerequisites
Great Oak Guardian in hand. All other permanents on the battlefield. Creatures you control can tap to produce at least {U}{R}. Vedalkan Mastermind does not have summoning sickness.