Cover of Darkness [Onslaught] 031 6 w/[Royal Knight] in traits[When

6 w/[Royal Knight] in traits[When Digivolving] You may place 1 card with [Royal Knight] in its traits and a play cost of 13 or less from your hand or trash under this Digimon as its bottom digivolution card

Everywhere

Set: International Collectors' Edition Type: Enchantment Rarity: Rare Cost: {2}{R} Whenever a player taps a land for mana

I have a few ideas of my own

Cover of Darkness [Onslaught] 031 6 w/[Royal Knight] in traits[WhenSet: Onslaught Type: Enchantment Rarity: Rare Cost: {1}{B} As Cover of Darkness enters the battlefield, choose a creature type. Creatures of the chosen type have fear. (They can't be blocked except by artifact creatures and or black creatures.)