High Priest of Atom

Whenever a creature attacks you or a planeswalker you control, put two radiation counters on it, unless its controller pays {2}.
(A creature gets the radiation sickness, if it has one
or more radiation counters on it. Creatures with the radiation sickness get -0/-1 for each radiation counter on them.)
Sacrifice High Priest of Atom: Double the number of radiation counters on target permanent.