Now, to dramatically increase the power of this card, all effects placed on this card is inflicted on ALL enemy units.
This is balanced because everything done to the enemy creatures is always inflicted on this card, it would be balanced and natural to allow any effects on this card to affect every enemy creature.
A nice mechanism is to place this on a Voodoo, so if I poison my Voodoo, its the equivalent of unleashing a Retrovirus + poison to the enemy.
Likewise, the following turn, every enemy unit loses health, causing Voodoo to lose health, causing loss of health for the opponent, causing double damage to the creatures.