Sentinel of the Nameless City [The Lost Caverns of Ixalan Prerelease Cards] Brainiac but per our waiver

but per our waiver

Thick smoke billows and twists to form disturbing faces that cackle and click their teeth to the popping embers

Set: Ultimate Masters Type: Legendary Creature — Merfolk Wizard Rarity: Rare Cost: {2}{U}{U} Whenever you cast an instant or sorcery spell

then create six 2/2 green Cat Warrior creature tokens with forestwalk

Sentinel of the Nameless City [The Lost Caverns of Ixalan Prerelease Cards] Brainiac but per our waiverSet: The Lost Caverns of Ixalan Prerelease Cards Type: Creature Merfolk Warrior Scout Rarity: Rare Cost: {2}{G} Vigilance Whenever Sentinel of the Nameless City enters the battlefield or attacks, create a Map token. (It's an artifact with "1, T, Sacrifice this artifact: Target creature you control explores. Activate only as a sorcery.") "Halt, traveler. Whatever you seek, you will not find it here."