Ashiok's first two loyalty abilities have strong synergy, mainly if the -2 is used first and subsequent +1 abilties pump those Nightmares
Alternatively, blinking the card will remove the counters, which can be another good reason to do so
(Activate only if this creature attacked this turn and only once each turn.) Creature - Human Berserker Color tag templates(None) Draugr Necromancer If a nontoken creature an opponent controls would die, exile that card with an ice counter on it instead
I think Endless One could be fine in a deck that has a focus on the +1/+1 counters on your creatures with cards like Avatar of the Resolute, but as a big payoff spell, the other options are miles better
It's a free country
This BGS 9.5-graded Alpha Copy Artifact sold for an impressive $29,400 in 2023, a price that reflects both its playability and extreme rarity