Giant Rat, Creator of Rules

First Strike, Haste, Trample
When Giant Rat, Creator of Rules enters the battlefield, create three 2/2 Rat tokens. At the beginning of each player's upkeep, create one
2/2 Rat token.
{x}{t} Each rat gains +X/+X where X is equal to
the number of Lands tapped.
Hello Sir! Welcome to the Rat Cafe. There's no rats
here, there's just uh, hamburgers!