Alluvion Constellas (UPR166) (UPR)

The first time Alluvion Constellas prevents arcane damage each turn, if it has less than 4 energy counters, you may put an energy counter on it.
Instant — Remove 2 energy counters from Alluvion Constellas: The next staff ability you activate this turn costs RRR less.
Arcane Barrier 1(If your hero would be dealt arcane damage, you may pay R to prevent 1 of that damage.)