Kurbis enters with a number of +1/+1 counters on it equal to the amount of mana spent to cast it.
Remove a +1/+1 counter from Kurbis: Prevent all damage that would be dealt this turn to another target creature with a +1/+1 counter on it.
Cast Kurbis early and pump tons of mana into it to load up +1/+1 counters, then proliferate and build a wide or tall counters-matter board. Kurbis acts as both a beater and a repeatable damage-prevention engine, protecting your key threats from removal and combat while you grind out value. You win by overwhelming the table with oversized, well-defended creatures.
Mono-green ramp lets you dump huge mana into Kurbis on cast for an immediate large body
Repeatable, flexible damage prevention protects your best counter-creatures from combat and burn
Synergizes deeply with proliferate and +1/+1 counter payoffs
Low mana value means it recasts cheaply if killed (though counters reset to mana spent)
Damage prevention does nothing against exile, -X/-X, sacrifice, or destroy effects
Mono-green struggles with interaction, card advantage in a pinch, and flyers/evasion
Kurbis's counters only enter based on mana spent, so a recast off low mana is weak
Removal-heavy tables can ignore the prevention and just exile your threats