Wrothgar, Stirrer of Spouts

Bloodthirst X where X is equal to the number of lands you controlled as Wrothgar, Stirrer of Spouts entered the battlefield.
Whenever Wrothgar, Stirrer of Spouts attacks, each other treefolk, saproling, dryad, plant, and elemental creature you control gets +X/+0 until
of turn where X is Wrothgar, Stirrer of Spouts' power.