Essence Manipulation

This spell costs {1} less to cast if you have a Dandân
poison. It costs an additional {1} less to cast for each
Dandân poison beyond two that you have.

(1 or 2 Dandan poison ==> this spell costs {3}{u}.
3 poison ==> {2}{u}. 4 poison ==> {1}{u}.
5+ poison ==> {u}.)

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