call to the grave won't last too long on the field.
why not try...
Magus of the Abyss?
And Steve is right, Warpworld is a bad choice for a deck that is mainly instants and sorcerys.
You could change it up and replace things like Terminate with Seal of Doom...
Permanent type versions of the spells.
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I Play Black/Black/With a Black Splash
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I am the culler of legends and the one who turns heroes into no more.
"Beast. Defiler. The source of all my pain"
-Ihsan's Shade on Baron Sengir