Evertide the Sun Lash

Lifelink, first strike, squadron
Creatures you control get +1/+1 for each
{r}, {g}, and {w} in their mana cost.
If you control 10 creatures, lands you control
add a additional mana of the type they
produce. At 30 creatures, lands you control
become 10/10 elementals with vigilance,
trample and haste.