Murktide Regent [Secret Lair Showdown] Professor Program Promos but it cannot be activated

but it cannot be activated unless you control a Fiend monster

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

Set: Exceed Apocalypse Card type: Digimon Rarity: Super Rare Digi type: Reptile Play Cost: 3 Form: Rookie Attribute: Data Digivolve Cost: 0 Digivolve Cost Level: 2 [[Digivolve] [Tsunomon]: Cost 0] [Start of Your Main Phase] 1 of your Digimon gains [Blocker] until the end of your opponent's turn

Set: Dimensional Phase Pre-Release Promos Card type: Digimon Rarity: Rare Digi type: Holy Dragon Play Cost: 8 Form: Ultimate Attribute: Vaccine Digivolve Cost: 3 Digivolve Cost Level: 4 [Main][Once Per Turn] By suspending this Digimon

for each of those monster(s) instead

Murktide Regent [Secret Lair Showdown] Professor Program Promos but it cannot be activatedSet: 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.