Korok

You may have any number of creatures named Korok in your deck.
Your maximum hand size is increased by 1.
As long as you control 5 or more Koroks, Koroks you control gain +2/+1.
As long as you control 10 or more Koroks, Koroks you control gain +1/+4, haste, and "{t}: Tap target creature."
As long as you control 15 or more Koroks, Koroks you control gain trample, double strike, and flying.