Barrack Obama

Whenever Barrack Obama or another Human enter the battlefield from your hand, add {u}{u} to your mana pool.
{t} {x}{x}{w} - Each Human you control gains x +1/+1 counters. Add {u} to your mana pool for each Human with a +1/+1 counter on them.
{t} {u}{u}{u}{u}{u}{u}{u} - Tap up to 6 target lands that are not Legendary.