Essence Manipulation

This spell costs {1} less to cast for each point of
Dandân poison that you have.
(1 Dandan poison ==> this spell costs {3}{u}.
2 poison ==> {2}{u}. 3 poison ==> {1}{u}.
4 or more poison ==> {u}.)

Change the text of target permanent by
replacing all instances of one basic land type
with another until end of turn. Draw a card.