Cloaked Cadet
Training rewards a creature for being the runt of the pack: attack alongside something bigger and the counter comes to the smaller body. This card wires that trigger to a payoff, drawing a card whenever one or more counters land on the Humans you control, and the two halves pull in opposite directions. Training wants this to be the weakest attacker in the swing, hanging back at 2/4 while a beefier creature outclasses it into counter after counter. The draw clause wants those counters scattered across a wide board of Humans, since any counter on any Human (not just this one) fires the trigger. The once-per-turn cap is the balancing wall: you cannot chain three separate counter sources into three cards in a single turn, so the reward is a steady one-a-turn drip rather than an explosive engine. That makes it less a combo piece than a value spine for a go-wide Human deck already leaning on counters, whether from training itself, sticky anthem effects, or dedicated counter-doublers. Left alone, the body is a defensive 2/4 that draws nothing; it wants a crowded battlefield and a reason to keep dropping counters. The elegance is in repurposing an aggressive keyword as a card-advantage lever, asking a tribal deck to keep attacking not just for damage but for the fuel that refills its hand.

