Shaman of the Great Hunt

Left alive for a single attack step, this snowballs faster than its price tag suggests, and the reason lives in the trigger's scope: the +1/+1 counter goes on whichever creature dealt the damage, so on a developed board every unblocked attacker becomes a permanent growth engine, not just the Shaman. Haste means it swings the turn it lands, and because it enters at 4 power it sits in ferocious range immediately, then climbs to 5 on its first connection. That is the hinge into the activated draw: the payoff scales with your power-4-and-up attackers, exactly the bodies the counters are busy manufacturing, so the card bootstraps from a fragile drop into a refuel outlet that also closes games. The activation demands green or blue mana even though the creature is mono-red, a deliberate tax that keeps the engine out of a straight aggro shell and pins the reward to a multicolor build. The 2-toughness body is what balances all of this: cheap removal kills it and trades up on mana, so the design punishes hesitation rather than punishing removal. Answer it on sight and you have spent well; leave it one attack and it rewrites the resource math, drawing several cards off a single swing while the board keeps inflating. The whole structure rewards committing creatures early, then converting that commitment into pressure and card flow from the same permanent.