Skeleton Army of Topoer

Delve (Each card you exile from your graveyard while casting this spell pays for {1}.)
Skeleton Army of Topoer enters the battlefield with X +1/+1 counters on it.
"Topoer used to have a vast army of humans like Forduuath. Ever since Ezerk the Necromancer took control, Topoer has had an even greater army, but of a different species."