Another underrated gem is Mogg Salvage, which is free at most games since it's super likely that somebody is playing blue
This refunds you 1 mana for the dragon, 2 if it lives through combat
Unfortunately for people looking for a quick n' easy evaluation, the answer is a frustrating "it depends," because it really depends how often your opponents are casting two or more spells per turn
This implied that a player might launch some serious attacks on turn one if they could stack their deck with 4 Black Lotus and were fortunate with the draw
But Nim Deathmantle (and cards like Angelic Renewal or Lifeline before it) push for a slightly different playstyle you protect your creature(s) already on board by reanimating them whenever they might die, punishing the opponent who removed them with a fresh round of triggers
Hercules, on the other hand, is the perfect embodiment of the Wonder Boy from the movie considering his terrifying strength of 6 and willpower of 5 combined with Resist +1 and Bodyguard