Here are 10 Magic The Gathering x Secret Lair x Planechase Cards from a recent event at MagicCon Atlanta. 

**10 Secret Lair Planechase Cards:**

1. Imaginary Friends
2. Math is for Blockers
3. Deceptive Divination
4. Finally! Left-Handed Magic Cards
5. sAnS MERcY
6. Mycosynthwave
7. Fblthp: Completely, Utterly, Totally Lost
8. Li'l Giri Saves the Day
9. We hope You like Squirrels
10. Happy Yargle Day!

How the cards were used in the modern deck format event:

**Redemption Challenge Ticket**

* As a special action, once during your turn you can call a judge to use your redemption challenge ticket to enter THE SECRET LAIR!
* Once a player has redeem their redemption challenge ticket, it can no longer be redeemed again.
* Once a player has brought the game into the Secret Lair, players cannot reenter the Secret Lair this game.

**The Secret Lair Deck**

* Entering the Secret Lair adds a specially designed deck of planechase cards to help turn the tide of the game.
* This variant uses all the rules for the Planechase format

**Event Prizes:**

* 1st: 2 Foil Lightning Bolt Promos and 1 Non-Foil Lightning Bolt
   * Additionally, their previous round opponents each receive 1 Non-Foil Lighting Bolt Promo.
* 2nd-8th: 1 Foil Lightning Bolt Promo and 1 Non-Foil Lightning Bolt Promo.
* 9th-16th: 1 Non-Foil Lightning Bolt Promo and 1 Foil Questing Druid Promo.
* 17th-64th: 1 Foil Questing Druid Promo.

Additionally, players will receive prizes each round based on the number of matches won.

* 4 Wins: Non-Foil Questing Druid Promo and Redemption Challenge Ticket
* 3 Wins: Foil Sudden Edict and Redemption Challenge Ticket
* 2 Wins: A Random Non-Foil Secret Lair

Secret Lair Spectacular x 10 Planechase Cards from Event @ MagicCon Atlanta