Essence Manipulation

If you have 20 or fewer life, this spell costs
{1} less to cast. It costs an additional {1} less to
cast for every 4 life less than 16 that you have.
(2 or 3 Dandan poison => this spell costs {3}{u}.
4p => {2}{u}. 5p => {1}{u}. 6p => {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.