The Last March of the Ents

Cast this Spell only if a Permanent you Control
left the Battlefield this Turn.
Each Ent Creature you Control gains +10 +10
and Gains trample, haste and must be blocked
this turn if able.
Sacrifice those creatures at the beginning of the
next end step.
"Come, my friends. The Ents are going to war. It is
likely that we go to our doom."