Keeper of Progenitus is one of those cards players keep asking about. Here is, in plain words, what its official text says, the rulings published by Wizards of the Coast, and the combos players actually run.
Official card text
Whenever a player taps a Mountain, Forest, or Plains for mana, that player adds one mana of any type that land produced.
Complete guide
Keeper of Progenitus is a powerful Elf Druid that accelerates mana production for every player at the table. By doubling the output of specific basic land types, it shifts the pace of the game into high gear. This card is a symmetrical effect, meaning your opponents can benefit from its bounty just as much as you can.
A Bounty for Three Land Types
The ability of Keeper of Progenitus is a triggered mana ability. It triggers whenever any player taps a Mountain, Forest, or Plains for mana. It does not matter if the land is basic or non-basic, as long as it has one of those three subtypes on its type line. When the trigger resolves, the player adds one additional mana of any type that the land already produced during that activation.
How the Trigger Resolves
Because this is a mana ability, it does not use the stack and cannot be responded to. As soon as a player taps a qualifying land for mana, the extra mana is added to their mana pool immediately. If a land has multiple types, such as a Forest Plains, the Keeper only triggers once per tap, providing exactly one additional mana.
Common Pitfalls
A frequent mistake is forgetting that Keeper of Progenitus affects all players. If you play this against an opponent using Red, Green, or White, you are effectively giving them a head start on their next turn. Additionally, the land must actually be tapped for mana; effects that put mana into your pool without tapping a land will not trigger the Keeper.
Strategic Deployment
The best time to play Keeper of Progenitus is when you have a hand full of expensive spells or ways to utilize the extra mana immediately. Since it costs four mana, you want to ensure it survives long enough for you to untap and cast your high-impact cards before your opponents can untap and use the extra mana themselves.
Interaction examples
Eternal WitnessIf you tap a Forest for Green mana while Keeper of Progenitus is on the battlefield, you add an additional Green mana. You can use this total of two mana to help pay the cost for Eternal Witness, allowing you to return a key card from your graveyard to your hand much earlier than usual.
Solemn SimulacrumWhen you play Solemn Simulacrum, you search for a basic land like a Mountain and put it onto the battlefield. Once that Mountain untaps, tapping it will trigger Keeper of Progenitus, granting you two Red mana. This synergy allows you to chain large creatures together rapidly by combining land search with mana doubling.
Guide written with AI from the official text and rulings. Official English text prevails.
How it works : Keeper of Progenitus
Original English text — Wizards of the Coast / Scryfall
No additional ruling has been published for this card.
Popular combos
Real combos played by the community, sorted by popularity.
Magus of the Candelabra + Staff of Domination + Keeper of Progenitus
- 1Activate five in any combination of Forests, Mountains and Plains by tapping them, adding
. - 2Keeper of Progenitus triggers five times, adding at least .
- 3Activate Magus of the Candelabra by paying and tapping it, untapping the five lands.
- 4Activate Staff of Domination's third ability by paying
and tapping it, untapping Magus of the Candelabra. - 5Activate Staff of Domination's first ability by paying
, untapping Staff of Domination. - 6Repeat.
- 7Once you have infinite mana, you may use it to activate Staff of Domination's other abilities.
Ashaya, Soul of the Wild + Magus of the Candelabra + Keeper of Progenitus
- 1Activate two lands by tapping them, adding at least
. - 2Keeper of Progenitus triggers twice, adding .
- 3Activate Magus of the Candelabra by paying and tapping it, untapping the two lands and Magus of the Candelabra.
- 4Repeat.
Ashaya, Soul of the Wild + Pili-Pala + Keeper of Progenitus
- 1Activate Pili-Pala by tapping it, adding
. - 2Activate Pili-Pala by paying and untapping it, adding one mana of any color.
- 3Repeat.
Springheart Nantuko + Overlord of the Hauntwoods + Keeper of Progenitus + Spelunking
- 1Declare Overlord of the Hauntwoods as an attacker.
- 2Overlord of the Hauntwoods triggers, creating an untapped Everywhere land token due to Spelunking.
- 3When the Everywhere token enters the battlefield, Springheart Nantuko triggers.
- 4Holding priority, activate Everywhere by tapping it, adding .
- 5Keeper of Progenitus triggers, adding .
- 6Resolve the Springheart Nantuko trigger, causing you to pay to create a token copy of Overlord of the Hauntwoods.
- 7When the Overlord of the Hauntwoods token enters the battlefield, it triggers, creating a tapped Everywhere land token.
- 8Repeat from step 3.
Earthcraft + Keeper of Progenitus + Ant Queen
- 1Activate Ant Queen by paying , creating a creature token
- 2Activate Earthcraft by tapping the creature token, untapping a basic Forest.
- 3Activate the Forest by tapping it, adding
- 4Keeper of Progenitus triggers, adding
- 5Repeat
Springheart Nantuko + Overlord of the Hauntwoods + Stone-Seeder Hierophant + Keeper of Progenitus
- 1Declare Overlord of the Hauntwoods as an attacker.
- 2Overlord of the Hauntwoods triggers, creating a tapped Everywhere land token.
- 3When the Everywhere token enters the battlefield, Stone-Seeder Hierophant and Springheart Nantuko trigger.
- 4Resolve the Stone-Seeder Hierophant trigger, untapping it
- 5Holding priority, activate Stone-Seeder Hierophant by tapping it, untapping the Everywhere token.
- 6Activate Everywhere by tapping it, adding .
- 7Keeper of Progenitus triggers, adding .
- 8Resolve the Springheart Nantuko trigger, causing you to pay to create a token copy of Overlord of the Hauntwoods.
Springheart Nantuko + Dryad Arbor + Keeper of Progenitus + Concordant Crossroads
- 1Play a land. When the land enters, Springheart Nantuko triggers, causing you to pay to create a token copy of Dryad Arbor.
- 2When the Dryad Arbor token enters, Springheart Nantuko triggers. Holding priority, activate the Dryad Arbor token by tapping it, adding .
- 3Keeper of Progenitus triggers, adding .
- 4Resolve the Springheart Nantuko trigger, causing you to pay to create a token copy of Dryad Arbor.
- 5Repeat from step 2.
Toph, the First Metalbender + Yavimaya, Cradle of Growth + Staff of Domination + Keeper of Progenitus
- 1Activate Staff of Domination by tapping it, adding as it's a Forest land due to Toph and Yavimaya.
- 2Keeper of Progenitus triggers, adding .
- 3Activate Staff of Domination's first ability by paying , untapping it.
- 4Repeat.
Legal formats
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