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This helps you put poison counters on your opponents in the early game, so you can focus on proliferating them later and dont have to worry about connecting with your fragile commander again

1 Ruxa, Patient Professor

Although I have a lot of fondness for Master of Death, I think my favorite so far is Unmarked Grave

Assassin's Creed (ACR) #132 Illustrated by Bastien L

While the counter on its own is a one time thing, having this trigger at the beginning of combat and then the ability to get that creature back with haste for that same combat makes a very tight window for opponents to deal with your shenanigans

Most aggro decks could never beat a play like that if you back it up with counterspells