What are some cards that

[Iandtormentor]

Make it so whenever a artifact/creature enters the battle field my opponent takes damage?

[Iandtormentor]

Are there any?

[Kagain123]

 {Pandemonium} is one

[Iandtormentor]

{Pandemonium} is one

thanks

[Bman0121]

 {Warstorm Surge}

[MisterJH]

Theres some guy with undying that has creatures that ETB from graveyards deal damage equal to their power

[Iandtormentor]

{Warstorm Surge}

are there any cheaper than this (mana wise) that are modern?

[Agarrita80]

 {Blazing Torch} kinda

[Iandtormentor]

{Blazing Torch} kinda

how?

[Rass]

 {Suture Priest}

[Rass]

Also I think there is a black one from the avcyn block


Never mind I was thinking of  {Blood Artist}

[Iandtormentor]

Ok I'm gonna look

[Iandtormentor]

Didn't see any

[Agarrita80]

 {Tezzeret, Agent of Bolas}

[The1337Magician]

 {Geralf's Messenger}
{Obzedat, Ghost Council}
{Massacre Wurm}
Things such as. Is that good or do you want deals damage.
{Blisterstick Shaman}
{Dong Zhou, the Tyrant}
And many others.