Yunshef

Whenever a creature you control is sacrificed, put a 4/1 green Plant Beast creature token with trample onto the battlefield.
{5}: Draw a card and reveal it, put {x} +1/+1 counters on target creature, where {x} is equal to the revealed card's converted mana cost.
A kingdom of scientists engrossed with life and the course of its evolution, a bit too engrossed some would say.