Of course, it has to die to do that, which means your opponents have to choose if its worth sacrificing their creatures, being slowly pinged to death, or just biting the bullet and hoping theyre not your target
For example, if there are two +1/+1 counters on Aerith Gainsborough and it gets three -1/-1 counters, you'll put two +1/+1 counters on each legendary creature you control when Aerith Gainsborough's third ability resolves
Ive personally had English booster boxes where I pulled a single IR and some generic EXs and nothing else
Where limits have been announced, the playmat is restricted to one per transaction and the Curators Collection to two
All of your non-Legendary creatures would get the same buff as Honor of the Pure, plus the additional upsides for all your Legends
This is how Infect, Amulet Bloom, and Twin approach the Burn matchup (not to mention decks like Storm, Griselbrand, and Affinity)