Rubblehulk

Oracle Text

Rubblehulk's power and toughness are each equal to the number of lands you control.

Bloodrush — 1RG, Discard Rubblehulk: Target attacking creature gets +X/+X until end of turn, where X is the number of lands you control.

Card Rulings

1/24/2013 The ability that defines Rubblehulk’s power and toughness works in all zones, not just the battlefield.
1/24/2013 If you activate Rubblehulk’s bloodrush ability, the value of X is the number of lands you control when that ability resolves.