Swamp Behemoth

Swamp Delve (Each swamp you exile from your
graveyard while casting this spell pays for {2}.)
Whenever a creature dies, put a +1/+1 counter
on Swamp Behemoth.
When Swamp Behemoth dies, search your
library for X swamps and put them onto the
battlefield tapped where X is the amount of
+1/+1 counters on Swamp Behemoth.