Saisei, the Death and Rebirth

Saisei can't be countered.

As an additional cost to cast Saisei, destroy each
creature you control. Saisei enters the battlefield
with a number of +1/+1 counters equal to the
number of creatures destroyed this way.

{t}: Remove any number of +1/+1 counters from
Saisei. Create that many 1/1 green Saproling
creature tokens with deathtouch and lifelink.