Bob, Graveyard Horticulturist

Landfall — Whenever a land enters the battlefield under your control, put a +1/+1 counter on Bob. Then create a
number of 0/1 plant creature tokens that says
"{t}, sacrifice this token to add one mana of any color"
equal to the number of +1/+1 counters on Bob.

{2}{u/r}{t}, Destroy target permanent, the owner creates a 0/1 plant creature token that says "{t}, sacrifice this token to add one mana of any color"