The Chaos KeeperHow it works & interactions with other cards

A Sealed Secret

When The Chaos Keeper enters the battlefield, you must provide a new, sealed Magic booster pack to place underneath it. This pack remains sealed and hidden from all players until The Chaos Keeper successfully deals combat damage to a player for the first time. The choice of the booster pack is yours, allowing for strategic selection based on the formats or sets that contain the tools you need most.

Resolution Step-by-Step

First, The Chaos Keeper must deal combat damage to a player. Once this occurs, the triggered ability goes on the stack. Upon the first resolution, you open the sealed booster pack. You then reveal all the cards within that pack and choose one to put into your hand. For any subsequent turns where The Chaos Keeper deals combat damage, you skip the opening step and simply choose one of the remaining cards from that same opened booster to put into your hand.

Strategic Implementation

Because The Chaos Keeper needs to connect with an opponent's life total, it functions best in decks that can provide evasion or protection. It is important to note that if The Chaos Keeper leaves the battlefield, the cards from the booster pack are no longer associated with it in a way that allows you to easily retrieve them through its ability if you cast it again; you would need a brand new pack for the new instance of the creature.

Common Pitfalls

Do not open the pack early! The card text explicitly states the pack should not be opened until the ability resolves for the first time. Additionally, remember that putting a card into your hand this way is not 'drawing' a card, so it will not trigger abilities that care about drawing, nor will it be affected by effects that prevent drawing.

Interaction examples

Mana Acceleration and Evasion

Ornithopter of Paradise

You use Ornithopter of Paradise to tap for Blue or Red mana to cast The Chaos Keeper on turn two. Since Ornithopter of Paradise has Flying, it can help chip away at blockers, but its primary role here is ensuring you have the specific colors needed to get your Elemental onto the field as early as possible to start looting the booster pack.

Generating Extra Value

Professional Face-Breaker

When The Chaos Keeper deals combat damage to a player, two things happen. First, The Chaos Keeper's ability triggers, allowing you to open your pack and take a card. Second, Professional Face-Breaker triggers because a creature dealt combat damage, giving you a Treasure token. This synergy provides you with both a fresh card in hand and the mana or exile-play potential to use it immediately.

Solo Expedition

If you play The Chaos Keeper alone, you must have a sealed pack ready. If you attack an open opponent and deal 2 damage, you open the pack (perhaps a Modern Horizons 3 booster). You reveal the contents, pick a powerful rare to put into your hand, and keep the remaining cards nearby. Next turn, if you hit again, you pick another card from those same revealed cards.