As such, just based on stats alone, Angel of Grace looks like a Standard-playable card, and this doesn't even include the additional upsides
The instant speed graveyard interaction Endurance provides combined with its stats, mana cost and evoke flexibility makes Endurance a great card in the field and the best card green currently offers
Unlike some of these other cards, you don't need the right color mana when you cast it to maximize its value, as you can pop off the counters later and draw three cards
Ultimately, it will come down to the prevalence of planeswalkers and battles as well as how many two toughness or fewer creatures are being played
Like most Magic: The Gathering cards, the value of Merseine depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (Fallen Empires)
The line between what constitutes Restriction versus Drawback often comes down to context, especially in a format as complex as Commander