Prowler can't be blocked by creatures with power 2 or less.
Whenever Prowler deals combat damage to a player, put a +1/+1 counter on another target creature you control.
Prowler is a cheap, evasive mono-green threat that snowballs your board by dropping +1/+1 counters onto your best creature each time it connects. Curve out, get Prowler swinging early since most chump blockers (power 2 or less) can't stop it, and funnel counters into a creature you intend to make lethal. Back it with counters-matters payoffs and protection so you grind out big, repeatable damage.
Built-in evasion makes Prowler hard to block and reliably trigger every turn
Cheap three-mana commander that comes down early and applies pressure fast
Mono-green gives access to the best ramp, counter synergies, and big-mana payoffs
Counter distribution lets you build a single haymaker or spread a wide board
Counters go on 'another' creature, so you need a second body to benefit
Relies on combat damage, vulnerable to fogs, flyers, and chump blockers with high power
Mono-green struggles with interaction, removal, and card draw compared to other colors
Removal-heavy tables can keep Prowler off the board and stall the engine