Greek Beasts!

[Venom]

Hi, fellaz. Its long time since I have been searching a theme for my Greek beasts Set (abandoned a month ago for a lack of a decent theme). Maybe here I will find what I am looking for.

This is the remaking I have in mind:

Mythical Beast - Venom Hydra Lv8
Lv: 8
Dark
Reptile/Effect
2000/1900
This card can only be Special Summoned from your hand by having exactly 4 "Mythical" monsters in your Graveyard. When you succesfully Summon this card, Special Summon as many Hydran Head Tokens (Level 3/Reptile/ATK800/DEF800) as free Monster Zones you control. As long as this card is face-up on your field, these tokens cannot declare an attack. For every Attack Position Hydran Head Token you control, raise this card's ATK by 300. You can Tribute 2 Hydran Head Tokens you control to equip a Venom Counter on 1 monster your opponent controls. The equipped monster loses 400 ATK at the begginning of it's controller's Standby Phase. If the equipped monster has 0 ATK, destroy it. If this card is destroyed by battle, all Hydran Head Tokens gain 600 ATK.

I have been thinking of effects that trigger from the Graveyard, but it seems too difficult to make. If anyone has ideas to help me, I would be very very grateful.