Cavernous Maw [The Lost Caverns of Ixalan] Alien Advisor Guest and it has "{2}{U}{U}: Return

and it has "{2}{U}{U}: Return this creature to its owner's hand at the beginning of the next end step

−7: You get an emblem with "Creatures you control have double strike

Now it's just a tunnel

To keep the Reality Chip out of Jin-Gitaxias's hands

Cavernous Maw [The Lost Caverns of Ixalan] Alien Advisor Guest and it has "{2}{U}{U}: ReturnSet: The Lost Caverns of Ixalan Type: Land Cave Rarity: Uncommon {T}: Add {C}. {2}: Cavernous Maw becomes a 3 3 Elemental creature until end of turn. It's still a Cave land. Activate only if the number of other Caves you control plus the number of Cave cards in your graveyard is three or greater. Many footprints lead into the cave. None lead out.