If the defending player has three or more cards in hand as Reaper of Night attacks, its ability won't trigger at all
It's strong everywhere, but it has enhanced value in archetypes that care about counters generally, +1/+1 counters specifically, proliferate tricks for multicolor brews looking to add loyalty counters for their planeswalkers, four and five-color decks, Commanders with evasion, Commanders with a power that, when increased by 1 get a faster kill, Equipment, Aura, and Voltron decks looking to get in kills with their Commander, and loads more
I feel that the ReshiBoar and Typhlosion decks may return to their position at Tier 1 or at least 1.5
Harabaz Druid Paradise Druid is yesterday's news
Voltaic Construct Anything that untaps without tapping itself is abusable
Illustrated by Leanna Crossan Standard Legal Alchemy Legal Pioneer Legal Historic Legal Modern Legal Brawl Legal Legacy Legal Comp