1) Destroyer 2) Ruiner 3) Undoer 4) Uprooter 5) Waster 
[ring theory] In mathematics, specifically module theory, the annihilator of a set is a concept generalizing torsion and orthogonality. ==Definitions== == Notes == ...
This ability is written Annihilator X. Whenever a creature with annihilator attacks, the defending player sacrifices X permanents. Annihilator abilities trigger and resolve during the declare attackers step. The defending player chooses and sacrifices the required number of permanents before he or she declares blockers. This is a triggered ability ...
• (n.) One who, or that which, annihilates; as, a fire annihilator.
An·ni'hi·la`tor noun One who, or that which, annihilates; as, a fire annihilator . 
[n] - a total destroyer
noun a total destroyer
a person or thing that annihilates. · the set of all linear functionals that map to zero all elements of a given subset of a vector space.