Murktide Regent [Secret Lair Showdown] Professor Program Promos cards on your field is

cards on your field is equal to or less than the number on your opponent's field

but it cannot be activated unless you control a Fiend monster

that ability triggers an additional time

Set: World Championships 2014 Type: Psychic Rarity: Ultra Rare Retreat cost: Colorless

Set: Labyrinth of Nightmare Card type: Normal Trap Rarity: Ultra Rare Attack: 0 Defense: 0 You can activate this card when a monster is Summoned (including Flip Summon and Special Summon)

Murktide Regent [Secret Lair Showdown] Professor Program Promos cards on your field isSet: Secret Lair Showdown Type: Creature Dragon Rarity: Mythic Cost: {5}{U}{U} Delve (Each card you exile from your graveyard while casting this spell pays for {1}.) Flying Murktide Regent enters the battlefield with a +1 +1 counter on it for each instant and sorcery card exiled with it. Whenever an instant or sorcery card leaves your graveyard, put a +1 +1 counter on Murktide Regent.