Ilrir, The Mana Tree

Landfall—Whenever a land enters the battlefield
under your control, Ilrir, The Mana Tree gets
+X/+X until end of turn for each land on the battlefield where X is the number of lands on the battlefield.
{t}: Add an amount of {g} equal to Ilrir's power.
"With the sacred tree's blessing, all is possible"
—Elder Druid