Ancient Greenwarden

Bracket

• B1 Exhibition — allowed: No restriction at this bracket
• B2 Core — allowed: No restriction at this bracket
• B3 Upgraded — allowed: No restriction at this bracket
• B4 Optimized — allowed: No restriction beyond the banned list
• B5 cEDH — allowed: No restriction beyond the banned list

Why

• No Game Changer, mass land denial, extra turn, tutor or two-card combo

How Lotus Vault estimates a bracket

Bracket: Lotus Vault analysis, with Commander Spellbook flags

Combos

59 known combos.

• Walk the Aeons + Azusa, Lost but Seeking + Ancient Greenwarden
  Produces: Infinite turns, Lock
  View on Commander Spellbook
• Aesi, Tyrant of Gyre Strait + Walk the Aeons + Mystic Sanctuary + Ancient Greenwarden
  Produces: Infinite turns, Lock
  View on Commander Spellbook
• Ancient Greenwarden + Mina and Denn, Wildborn + Lotus Cobra + Retreat to Coralhelm + Sakura-Tribe Scout
  Produces: Infinite landfall triggers, Infinite mana creatures you control can produce, Infinite scry 1
  View on Commander Spellbook

Combos: Commander Spellbook

Rulings

• 2020-09-25 · Wizards of the Coast
  Ancient Greenwarden allows you to play a modal double-faced card's land face, but not a nonland face.
• 2020-09-25 · Wizards of the Coast
  Ancient Greenwarden doesn't change the times when you can play those lands. You can still play only one land per turn, and only during your main phase when you have priority and the stack is empty.
• 2020-09-25 · Wizards of the Coast
  Ancient Greenwarden doesn't allow you to activate abilities (such as cycling) of land cards in your graveyard.
• 2020-09-25 · Wizards of the Coast
  An ability that triggers whenever you play a land won't trigger an additional time.
• 2020-09-25 · Wizards of the Coast
  The trigger event doesn't have to specifically refer to "lands." For example, an ability that triggers "whenever a creature enters the battlefield under your control" would trigger twice if the entering land is also a creature.
• 2020-09-25 · Wizards of the Coast
  If you control two Ancient Greenwardens, a land entering the battlefield causes abilities to trigger three times, not four. A third Ancient Greenwarden causes abilities to trigger four times, a fourth causes abilities to trigger five times, and so on.
• 2020-09-25 · Wizards of the Coast
  Replacement effects are unaffected by Ancient Greenwarden's third ability. This includes any abilities that apply "as [this land] enters the battlefield" and any ability that says the land enters the battlefield with counters.
• 2020-09-25 · Wizards of the Coast
  Ancient Greenwarden's effect doesn't copy the triggered ability; it causes the ability to trigger twice. Any choices made as you put the ability onto the stack, such as modes and targets, are made separately for each instance of the ability. Any choices made on resolution, such as whether to put counters on a permanent, are also made individually.
• 2020-09-25 · Wizards of the Coast
  Look at each permanent as it exists on the battlefield, taking into account continuous effects, to determine whether any triggered abilities will trigger multiple times. For example, if you control Ashaya, Soul of the Wild, a nontoken creature entering the battlefield will cause any appropriate abilities to trigger an additional time.
• 2020-09-25 · Wizards of the Coast
  Ancient Greenwarden's third ability affects a land's own enters-the-battlefield triggered abilities as well as other triggered abilities that trigger when that land enters the battlefield, such as landfall abilities. Such triggered abilities start with "when" or "whenever."
• 2020-09-25 · Wizards of the Coast
  If a land entering the battlefield at the same time as Ancient Greenwarden (including Ancient Greenwarden itself if an effect causes it to be a land) causes a triggered ability of a permanent you control to trigger, that ability triggers an additional time.

Rulings: Scryfall · Wizards of the Coast