Kanu System

Whenever a Human enters the battlefield under your control, you may tap two untapped lands you control. If you do, put a +1/+1 counter on that creature.
That creature gains Kapu Wela.
(Kapu Wela — Whenever a creature an opponent controls becomes untapped, this creature deals 2 damage to it.)
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"To plant the piko in sacred soil is to root a chief’s bloodline in the 'aina."