Evil Mind

If you control a Fiend monster: Activate 1 of these effects, based on the number of monsters in your opponent's GY; ● 1+: Draw 1 card. ● 4+: Add 1 "HERO" monster or 1 "Dark Fusion" from your Deck to your hand. ● 10+: Add 1 "Polymerization" Spell or 1 "Fusion" Spell from your Deck to your hand. You can only activate 1 "Evil Mind" per turn.