Creature - Human Warlock
Training (Whenever this creature attacks with another creature with greater power, put a +1/+1 counter on this creature.)
, Remove two +1/+1 counters from among creatures you control: Destroy target artifact or enchantment.
Assuming you play this guy on turn one, it can't activate until after it attacks turn 4, which might be a little late to destroy Thran Dynamos and Moats. With that said, it can still consistently play as a 1 mana 2/3 or 3/4 with upside, and even has some cute synergies with cards like Hangarback Walker and Luminarch Aspirant among others.
A 2/1 on turn 1 deals 6 damage by turn 4, and Hopeful Initiate deals at most the same amount of damage on the same turn, sometimes less, but leaves behind a latrger body with a relevant ability. Not sure how this compares to more mid-tier white one drops like Usher of the Fallen or Esper Sentinel.