5 Laelia, the Blade Reforged The Spirit Of Aggression Another great pairing with Karlach is Laelia, the Blade Reforged
While resolving Crypt Lurker's ability, you can't sacrifice more than one creature, discard more than one card, or do both to draw more than one card
I really hope this is not the new normal: low-value Secret Lairs with a small chance at opening an exciting card

Redeemable Codes Promotional Code OverTheMoon Promotional Code InnerDemon Promotional Code ShieldsUp Promotional Code WrittenInStone Buy With Gems 500 Gems in the Card Style Shop Ajani, the Greathearted Ral, Storm Conduit Tamiyo, Collector of Tales Teferi, Time Raveler Chandra, Fire Artisan Domri, Anarch of Bolas Nissa, Who Shakes the World Karn, the Great Creator 600 Gems Buy With Gold 2,000 Gold in the Card Style Shop Davriel, Rogue Shadowmage Jiang Yanggu, Wildcrafter Kaya, Bane of the Dead Kiora, Behemoth Beckoner Saheeli, Sublime Artificer Win in Events Win Matches in War of the Spark Saga I Momir Planeswalker (5/23-5/31) Win Matches in War of the Spark Saga II Pauper (5/31-6/7) Win Matches in War of the Spark Saga III Singleton (6/7-6/14) Win Matches in War of the Spark Saga IV Counters (6/14-6/21) Coming Soon The sources of the remaining planeswalkers have yet to be officially revealed, but MTG Arena forum user Emerald_Boar seems to have datamined that information

If the ninjutsu ability had been introduced in a different set, with different flavor and on different creatures, I wonder if it would have become another recurring mechanic, like cycling or convoke
This triggered ability has no source and is controlled by the active player