Desecration Elemental [Fifth Dawn] Cyborg Knight You can only use this

You can only use this effect of "Ra'ten

Set: Core Set 2019 Type: Enchantment — Aura Rarity: Common Cost: {1}{U}{U} Enchant creature

Set: Structure Deck: Zombie Horde Card type: Normal Spell Rarity: Common Send 1 monster from your deck to the GY

You can only use this effect of "Artifact Mjolnir" once per turn

except "Deskbot Base"

Desecration Elemental [Fifth Dawn] Cyborg Knight You can only use thisSet: Fifth Dawn Type: Creature Elemental Rarity: Rare Cost: {3}{B} Fear (This creature can't be blocked except by artifact creatures and or black creatures.) Whenever a player casts a spell, sacrifice a creature. Its precious corpses dance like puppets to attract mindless nim prey.