hypnosis (consensual) or mind control (non-consensual). You can’t tag both.

@Robobacon12  
Overpowered? You mean they stopped the power-creep.

@WouldBeAngel  
Thank you! I’ll remake them.

Also, I PSCT’d them for you :)
 
Starlight:
 
Spell Effect: If you control no Monsters: You can send this card to the GY, and if you do, Special Summon 2 Level 4 DARK Monsters from your Deck in Defence Position. They cannot attack.
 
Monster Effect: As long as this card remains face-up, once per turn: You can banish two monsters from your GY, add 1 Spell Card from your Deck to your Hand.
 
Spike:
 
Spell Effect: If a Monster you control is destroyed by an opponent’s card effect, you can Special Summon this card as a Monster to your Field.
 
Monster effect: All DARK Monsters gain 300 ATK and DEF during your turns only.

I wonder if they count as “Crystal” Monsters for the purposes of the Crystal Beast archetype…

Pretty cute designs though if used in a yugioh deck today, starlight would be op x3