Poseidon, the Almighty

+2: Create a 2/5 green Tortoise creature with haste and vigilance that can block up to 5 creatures. It is indestructible until the end of your turn.
-2: All lands owned turn into X/X land tortoises, X being the number of lands you own. They each can block up to 5 creatures. They can't be attacked.
-10: You gain life equal to the combined toughness of all permanents on the battlefield, opponent's included.