Alluvion Constellas (UPR166) [Uprising]

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.
<br><strong>Instant</strong> — Remove 2 energy counters from Alluvion Constellas: The next staff ability you activate this turn costs RRR less.
<br>Arcane Barrier 1<em>(If your hero would be dealt arcane damage, you may pay R to prevent 1 of that damage.)</em>